In savage worlds, the Berserk edge causes a hero to "attack with reckless abandon." He can also leave berserk by doing nothing on his turn (not even movement) and passing a smarts roll at -2.
I'm planning to run a zombie game, and sometimes the PCs will be forced to run from hordes of zombies. If a PC goes berserk, are they compelled to continue to kill zombies?
Can they run away with enemies in front of them?