The Pentagon Thief is the boss of the map "Five". The Thief comes every 4-8 rounds, and attempts to steal one of your weapons. It is best to leave out you most powerful weapon as you shoot him, but when he comes close, switch to you least favorite gun. If the thief is killed after he steals a gun, it will drop a Fire Sale. if you kill the theif before he takes anyones gun, it will drop a Bonfire Sale. Also whether he takes one or not he will always drop a Max Ammo even if not killed.
