I was wondering how you guys make monsters teleport into the map. I always do this thing with the wall where walking over a line lowers a wall that is behind a mid texture so the monster can see you and walk over the teleport line, but this is inconsistent at best. I thought maybe I could make walking over the line reveal a dummy doom guy that the monsters would see and make walk over the tp line in a completely different sector. But I'm not sure how well this would work.