How do I make barney sit down, like at the beginning of anomalous materials? Also, I have a question about creating defusable bombs in HL single player (I don't map for CS): Would this entity setup work?: You enter a room and walk over a tripwire laser (trigger_once, env_beam to make the laser visible). This triggers a bomb in 2 minutes (env_explosion and a brush which resembles an explosive device). You leave the room and find the bomb in 1 minute. You press the button attached to it and the button activates a trigger_relay which killtargets the env_explosion, and therefore defuses the bomb.