While walking into a building in a small unnamed village I shot an un-aggravated zombie with a suppressed pistol, the shots did no damage to the zombie, my player was also unable to aim while crouching and would automatically stand up if aiming in.

After aggravating the zombie with my shots I ran out the building and faced 2 more zombies, I pulled out my suppressed m4A1 and still no shots did damage to any of the 3 zombies, I used a whole magazine from both the pistol and M4A1, I lost alot of blood and almost died. I ran to safety and logged out.