This is my idea: the player has to get out from an exploding 'compound'. They to keep running or else a triggger_hurt will catch up with you (killing the player). Is it possible to make a trigger_hurt move, or follow you? I was also wondering if this would work with other entities eg. lights, sounds, sprites.
I seem to remember there was one point on HL when you are in a pipe and a Grunt chucks in a satchel, and it explodes, sending a flame down the tube - so it must be able to be done. I have checked most of the tuts on this site and have experimented myself but I cant seem to get it right.
Any help would be appreciated