@12Me21(View Post) EHOLE isn't really hidden, it's just really dim (like, in a scale of 100, it's only 1% white). And if you add 50 greens to 1 white, you'll get 51 greens and 1 red and 1 blue. 51 greens is brighter than 50 greens, just enough to show up.
I'm pretty sure boxmein is right and they are drawn in the correct order. If walls were really drawn after glow, it would be much more obvious. VIBR probably uses the additive glow, it only adds color to whatever was under the glow, not overwrites it. That would explain why you can still faintly see the wall.