diff --git a/Makefile.mak b/Makefile.mak
index e970bb85..02d83bb0 100644
--- a/Makefile.mak
+++ b/Makefile.mak
@@ -135,7 +135,7 @@ bin\th05\op.exe: bin\th05\op.obj th05\op_01.cpp
 $**
 |
 
-bin\th05\main.exe: bin\th05\main.obj th05\p_common.cpp th05\p_reimu.cpp th05\p_marisa.cpp th05\p_mima.cpp th05\p_yuuka.cpp bin\th05\player.obj bin\th05\hud_bar.obj bin\th05\scoreupd.obj th05\main011.cpp th05\main012.cpp  bin\th05\bullet.obj th05\main031.cpp th05\main032.cpp th05\main033.cpp
+bin\th05\main.exe: bin\th05\main.obj th05\main010.cpp th05\p_common.cpp th05\p_reimu.cpp th05\p_marisa.cpp th05\p_mima.cpp th05\p_yuuka.cpp bin\th05\player.obj bin\th05\hud_bar.obj bin\th05\scoreupd.obj th05\main011.cpp th05\main012.cpp  bin\th05\bullet.obj th05\main031.cpp th05\main032.cpp th05\main033.cpp
 	$(CC) $(CFLAGS) -ml -3 -Z -DGAME=5 -DBINARY='M' -nbin\th05\ -eMAIN.EXE @&&|
 $**
 |
diff --git a/th01/math/subpixel.hpp b/th01/math/subpixel.hpp
index ee3807df..f64d77e8 100644
--- a/th01/math/subpixel.hpp
+++ b/th01/math/subpixel.hpp
@@ -42,6 +42,10 @@ public:
 		return v >> 4;
 	}
 
+	operator T() const {
+		return v;
+	}
+
 	static T None() {
 		return to_sp(PIXEL_NONE);
 	}
diff --git a/th04/main/drawp.hpp b/th04/main/drawp.hpp
new file mode 100644
index 00000000..fe6627eb
--- /dev/null
+++ b/th04/main/drawp.hpp
@@ -0,0 +1,2 @@
+// A random shared point variable used for drawing various things.
+extern SPPoint drawpoint;
diff --git a/th04/main/drawpoint[bss].asm b/th04/main/drawpoint[bss].asm
index 501c899e..08830a4e 100644
--- a/th04/main/drawpoint[bss].asm
+++ b/th04/main/drawpoint[bss].asm
@@ -1,3 +1,2 @@
-; A random shared point variable used for drawing various things.
 public _drawpoint
 _drawpoint	Point <?>
diff --git a/th04/math/vector.hpp b/th04/math/vector.hpp
index 560e0806..0590465f 100644
--- a/th04/math/vector.hpp
+++ b/th04/math/vector.hpp
@@ -8,5 +8,9 @@ int pascal near vector2_near(
 );
 
 int pascal vector2_at(
-	Point near &ret, int origin_x, int origin_y, int length, int angle
+	SPPoint near &ret,
+	subpixel_t origin_x,
+	subpixel_t origin_y,
+	subpixel_t length,
+	int angle
 );
diff --git a/th05/main/boss/render.cpp b/th05/main/boss/render.cpp
index 855d9ae6..dd8933cd 100644
--- a/th05/main/boss/render.cpp
+++ b/th05/main/boss/render.cpp
@@ -3,6 +3,12 @@
  * Rendering code for all bosses
  */
 
+#include <master.h>
+#include "th01/math/subpixel.hpp"
+#include "th04/math/vector.hpp"
+#include "th04/main/drawp.hpp"
+#include "th04/main/playfld.h"
+
 /// Structures
 /// ----------
 #define BOSS_PARTICLE_COUNT 64
@@ -36,3 +42,21 @@ struct lineset_t {
 extern boss_particle_t boss_particles[BOSS_PARTICLE_COUNT];
 extern lineset_t linesets[LINESET_COUNT];
 /// ----------
+
+// Draws the given line out of [set] with the current GRCG tile and color.
+void pascal near grcg_lineset_line_put(lineset_t near &set, int i)
+{
+	vector2_at(drawpoint,
+		set.center[i].x, set.center[i].y, set.radius[i], set.angle[i]
+	);
+	int x1 = (PLAYFIELD_X + drawpoint.x.to_screen());
+	int y1 = (PLAYFIELD_Y + drawpoint.y.to_screen());
+
+	vector2_at(drawpoint,
+		set.center[i].x, set.center[i].y, set.radius[i], (set.angle[i] + 0x80)
+	);
+	int x2 = (PLAYFIELD_X + drawpoint.x.to_screen());
+	int y2 = (PLAYFIELD_Y + drawpoint.y.to_screen());
+
+	grcg_line(x1, y1, x2, y2);
+}
diff --git a/th05/main010.cpp b/th05/main010.cpp
new file mode 100644
index 00000000..d73f6fed
--- /dev/null
+++ b/th05/main010.cpp
@@ -0,0 +1,10 @@
+/* ReC98
+ * -----
+ * 1st part of code segment #1 of TH05's MAIN.EXE
+ */
+
+#pragma codeseg main__TEXT main_01
+
+extern "C" {
+#include "th05/main/boss/render.cpp"
+}
diff --git a/th05_main.asm b/th05_main.asm
index e1d1ec9a..b53d5a56 100644
--- a/th05_main.asm
+++ b/th05_main.asm
@@ -4026,83 +4026,13 @@ loc_D4F4:
 		leave
 		retn
 sub_D3C6	endp
+
+	GRCG_LINESET_LINE_PUT procdesc pascal near \
+		set:near ptr, i:word
 main__TEXT	ends
 
 main_0_TEXT	segment	word public 'CODE' use16
 
-; =============== S U B	R O U T	I N E =======================================
-
-; Attributes: bp-based frame
-
-sub_D4F8	proc near
-
-var_8		= word ptr -8
-var_6		= word ptr -6
-var_4		= word ptr -4
-var_2		= word ptr -2
-arg_0		= word ptr  4
-arg_2		= word ptr  6
-
-		enter	8, 0
-		push	si
-		push	di
-		mov	si, [bp+arg_2]
-		mov	di, [bp+arg_0]
-		push	offset _drawpoint
-		mov	bx, di
-		shl	bx, 2
-		push	[bx+si+lineset_t.LS_center.x]
-		mov	bx, di
-		shl	bx, 2
-		push	[bx+si+lineset_t.LS_center.y]
-		mov	bx, di
-		add	bx, bx
-		push	[bx+si+lineset_t.LS_radius]
-		mov	bx, di
-		mov	al, [bx+si+lineset_t.LS_angle]
-		mov	ah, 0
-		push	ax
-		call	vector2_at
-		mov	ax, _drawpoint.x
-		sar	ax, 4
-		add	ax, 32
-		mov	[bp+var_2], ax
-		mov	ax, _drawpoint.y
-		sar	ax, 4
-		add	ax, 16
-		mov	[bp+var_4], ax
-		push	offset _drawpoint
-		mov	bx, di
-		shl	bx, 2
-		push	[bx+si+lineset_t.LS_center.x]
-		mov	bx, di
-		shl	bx, 2
-		push	[bx+si+lineset_t.LS_center.y]
-		mov	bx, di
-		add	bx, bx
-		push	[bx+si+lineset_t.LS_radius]
-		mov	bx, di
-		mov	al, [bx+si+lineset_t.LS_angle]
-		mov	ah, 0
-		add	ax, 80h
-		push	ax
-		call	vector2_at
-		mov	ax, _drawpoint.x
-		sar	ax, 4
-		add	ax, 32
-		mov	[bp+var_6], ax
-		mov	ax, _drawpoint.y
-		sar	ax, 4
-		add	ax, 16
-		mov	[bp+var_8], ax
-		call	grcg_line pascal, [bp+var_2], [bp+var_4], [bp+var_6], ax
-		pop	di
-		pop	si
-		leave
-		retn	4
-sub_D4F8	endp
-
-
 ; =============== S U B	R O U T	I N E =======================================
 
 ; Attributes: bp-based frame
@@ -4201,34 +4131,18 @@ loc_D630:
 		mov	ah, GC_BRG
 		call	_grcg_setcolor_direct_seg1_raw
 		call	sub_D327
-		push	offset lineset0
-		push	12h
-		call	sub_D4F8
-		push	offset lineset0
-		push	0Ch
-		call	sub_D4F8
-		push	offset lineset1
-		push	12h
-		call	sub_D4F8
-		push	offset lineset1
-		push	0Ch
-		call	sub_D4F8
+		call	grcg_lineset_line_put pascal, offset lineset0, 18
+		call	grcg_lineset_line_put pascal, offset lineset0, 12
+		call	grcg_lineset_line_put pascal, offset lineset1, 18
+		call	grcg_lineset_line_put pascal, offset lineset1, 12
 		mov	ah, GC_RG
 		call	_grcg_setcolor_direct_seg1_raw
-		push	offset lineset0
-		push	6
-		call	sub_D4F8
-		push	offset lineset1
-		push	6
-		call	sub_D4F8
+		call	grcg_lineset_line_put pascal, offset lineset0, 6
+		call	grcg_lineset_line_put pascal, offset lineset1, 6
 		mov	ah, 0Fh
 		call	_grcg_setcolor_direct_seg1_raw
-		push	offset lineset0
-		push	0
-		call	sub_D4F8
-		push	offset lineset1
-		push	0
-		call	sub_D4F8
+		call	grcg_lineset_line_put pascal, offset lineset0, 0
+		call	grcg_lineset_line_put pascal, offset lineset1, 0
 		GRCG_OFF_CLOBBERING dx
 		pop	di
 		pop	si
@@ -4462,34 +4376,18 @@ loc_D82E:
 		mov	ah, GC_BRG
 		call	_grcg_setcolor_direct_seg1_raw
 		call	sub_D327
-		push	offset lineset0
-		push	12h
-		call	sub_D4F8
-		push	offset lineset0
-		push	0Ch
-		call	sub_D4F8
-		push	offset lineset1
-		push	12h
-		call	sub_D4F8
-		push	offset lineset1
-		push	0Ch
-		call	sub_D4F8
+		call	grcg_lineset_line_put pascal, offset lineset0, 18
+		call	grcg_lineset_line_put pascal, offset lineset0, 12
+		call	grcg_lineset_line_put pascal, offset lineset1, 18
+		call	grcg_lineset_line_put pascal, offset lineset1, 12
 		mov	ah, GC_RG
 		call	_grcg_setcolor_direct_seg1_raw
-		push	offset lineset0
-		push	6
-		call	sub_D4F8
-		push	offset lineset1
-		push	6
-		call	sub_D4F8
+		call	grcg_lineset_line_put pascal, offset lineset0, 6
+		call	grcg_lineset_line_put pascal, offset lineset1, 6
 		mov	ah, 0Fh
 		call	_grcg_setcolor_direct_seg1_raw
-		push	offset lineset0
-		push	0
-		call	sub_D4F8
-		push	offset lineset1
-		push	0
-		call	sub_D4F8
+		call	grcg_lineset_line_put pascal, offset lineset0, 0
+		call	grcg_lineset_line_put pascal, offset lineset1, 0
 		GRCG_OFF_CLOBBERING dx
 		pop	di
 		pop	si
@@ -4688,34 +4586,18 @@ loc_D9C6:
 		mov	ah, GC_BRG
 		call	_grcg_setcolor_direct_seg1_raw
 		call	sub_D327
-		push	offset lineset0
-		push	12h
-		call	sub_D4F8
-		push	offset lineset0
-		push	0Ch
-		call	sub_D4F8
-		push	offset lineset1
-		push	12h
-		call	sub_D4F8
-		push	offset lineset1
-		push	0Ch
-		call	sub_D4F8
+		call	grcg_lineset_line_put pascal, offset lineset0, 18
+		call	grcg_lineset_line_put pascal, offset lineset0, 12
+		call	grcg_lineset_line_put pascal, offset lineset1, 18
+		call	grcg_lineset_line_put pascal, offset lineset1, 12
 		mov	ah, GC_RG
 		call	_grcg_setcolor_direct_seg1_raw
-		push	offset lineset0
-		push	6
-		call	sub_D4F8
-		push	offset lineset1
-		push	6
-		call	sub_D4F8
+		call	grcg_lineset_line_put pascal, offset lineset0, 6
+		call	grcg_lineset_line_put pascal, offset lineset1, 6
 		mov	ah, 0Fh
 		call	_grcg_setcolor_direct_seg1_raw
-		push	offset lineset0
-		push	0
-		call	sub_D4F8
-		push	offset lineset1
-		push	0
-		call	sub_D4F8
+		call	grcg_lineset_line_put pascal, offset lineset0, 0
+		call	grcg_lineset_line_put pascal, offset lineset1, 0
 		GRCG_OFF_CLOBBERING dx
 		pop	di
 		pop	si