diff --git a/game/reconstructed/btl4gaug.cpp b/game/reconstructed/btl4gaug.cpp
index 3e54f0c..d53370b 100644
--- a/game/reconstructed/btl4gaug.cpp
+++ b/game/reconstructed/btl4gaug.cpp
@@ -1758,27 +1758,32 @@ void HorizTwoPartBar::Execute()
 
 	if (warnPix != previousFull || valPix != previousFill)
 	{
-		// Zone 1 [0, warnPix): the striped tile (the binary's tiled blit, NOT a
-		// solid fill).  SetColor(backgroundColor) is the tile's opaque backdrop.
+		// COLOUR MAP (binary @004c4340): the two colour params land at [this+0xA0]
+		// = fillColor (0xff, green) and [this+0xA4] = backgroundColor (0, black).
+		// Zone 1 SetColor + the tile dots + the zone-2 over-degrade fill use the
+		// GREEN; only zone 3 (the unfilled remainder) is BLACK.  The port had these
+		// swapped -> the whole [valPix,width] remainder rendered green.
+		//
+		// Zone 1 [0, warnPix): the striped tile, green dots on black.
 		L4Warehouse *warehouse = (L4Warehouse *)renderer->warehousePointer;
 		BitMap *tile = warehouse->bitMapBin.Get(tileImage);			// FUN_00442aec
-		localView.SetColor(backgroundColor);						// vtbl+0x18 @004c443a
-		DrawTiledBitmap(&localView, 0, 0, warnPix - 1, height, fillColor, tile);
+		localView.SetColor(fillColor);								// vtbl+0x18 @004c443a ([0xA0]=green)
+		DrawTiledBitmap(&localView, 0, 0, warnPix - 1, height, backgroundColor, tile);
 		warehouse->bitMapBin.Release(tileImage);					// FUN_00442c12
 
-		// Zone 2 [warnPix, valPix): backgroundColor (binary keeps the current
-		// colour, still backgroundColor from zone 1) -- only when value > low.
+		// Zone 2 [warnPix, valPix): the green over-degrade fill (binary keeps the
+		// current colour, still fillColor from zone 1) -- only when value > low.
 		if (valPix > warnPix)
 		{
-			localView.SetColor(backgroundColor);
+			localView.SetColor(fillColor);
 			localView.MoveToAbsolute(warnPix, 0);					// vtbl+0x24
 			localView.DrawFilledRectangleToAbsolute(valPix - 1, height);	// vtbl+0x48
 		}
 
-		// Zone 3 [valPix, width): the solid fill colour.
+		// Zone 3 [valPix, width): the unfilled remainder -- backgroundColor (black).
 		if (valPix < width)
 		{
-			localView.SetColor(fillColor);							// @004c44da
+			localView.SetColor(backgroundColor);					// @004c44da ([0xA4]=black)
 			localView.MoveToAbsolute(valPix, 0);
 			localView.DrawFilledRectangleToAbsolute(width, height);
 		}