get his ip address, ban the ip address guy, tell others about what happened, go through ALL the servers and explain that wasn't you.
THEN, go to EVERY forums about tremulous and say it wasn't you.
THEN, hunt down this name stealer and torture him until he can't talk anymore (cut off his lips off or something) THEN, cut off his ears, THEN cut off his toes, fingers, fingernails, toenails, eyelids, eyelashes, hair (pluck it out or something) and if the person is a different gender and you are a really sick pervert, their private hair =/.
THEN, kill him. Maybe burn him, or maybe just cut off his body limbs and sew it back on with him still alive (ouch!)
Did I mention to go to all forums and say it wasn't you?
PS, to track him down, ummm... call FBI or CIA or something and ask for help. If they don't then HUNT THOSE GUYS DOWN and torture them until they do something.
