There I was, a level 45 against level 1 zombies.
It was the funniest thing ever. One kick, one dead zombie. Punch a thug 3 times?
Dead.
I did my best to just follow him around and let him kill the zombies (occasionally giving him a hand) and laughing when he'd get beat down by a thug, but we played for a couple of hours and I didn't use a weapon once.