You know that level in Half Life (1) where you are in the ordnance storage facility, and if you set of an explosive of any kind, let it be grenade, tripmine or ARGrenade, it triggers the multisource that ends the level.
What entities are they using that trigger the "end entities" as i shall dub them - when an explosion goes off. Fair enough, its easy to do with teh tripmines, but how do they make it trigger if handgrenades, ARGrenades or satchells are used?