While playing on my private server with one friend, we were in the military base at Tisy approaching the large bunker west of the statue when we came upon wolves attacking infected. We ran into the large bunker and I fired at the wolves. The wolves were not able to see us and began moving very slow at the front of the bunker. They never entered the bunker and were summarily dispatched by M4 fire with no threat to me or my friend, much to my disappointment. We were the only players on the server. Unsuppressed weapon fire attracted infected that gathered at the top of the bunker where they just ran around up there, as if they were confusing the top of the bunker with the space beneath it. I had to go outside and get on top of the bunker to dispatch the infected that had gathered.