Would there be a way to block bullets from just one side?

maybe put the block bullets texture from one side of the brush, and paint the rest with the invisible texture... just guessing

Yeah that would work.

I'm not sure this might work out well, mainly cause the Block_bullets textures is really finicky, but try it out anyways, if not then theirs no real other way.

Well assuming that the texture works for Portal then yeah, it should work.

a tad off topic, but: is there a phys_clip texture? Like how there's player and npc clips?

Hello again Portalboat.