Bats are very normal at Disovery, I see them every time I fish the sunset bite. However, I've never tangled one, and I've never had bats swooping at me. It's normal to see hundreds over the lake, lots of food there at dusk. In fact I figure my bug bites would double without them. So I've never left because of them. In fact had I not been working my way back I would have stayed. Though they did get the adrenaline going, and I wouldn't have stayed at that exact spot.