I actually LIKE the bats, in relatively small numbers. If there are too many flying around over head, well, let's just say that it could get messy. I remember once when I was leading cave tours, on this one tour there was a bat that decided to come along and put on quite a show. I thought it was great. We didn't see a lot bats in that cave system. So I stopped the tour so that we could watch his antics. Then I realized that some of the guests were getting a bit unnerved.
Bats carry rabies. Gotta be very careful when one acts strangely. It's probably sick.