I tried to kill a zombie with a wrench and a screw driver with no luck. I was unable to even leave a scratch.
- Legacy ID
These weapons are supposed to be crap, and a last-ditch effort. How long were you fighting the zombie? Where you hitting it in the head? Only an axe kills in a few hits, a pipe wrench takes 15-20 hits at the very least to kill a zombie.
So not really a bug.