After foolishly attempting to shoot the new animal in my cave-home with a bow, at the same time as my friend the bat of course attacked me. We exchanged a few blows before I went down, and then the lone bat continued to attack me. It seemed to do a defense move, followed by two attacks the second of which killed me. There was indeed only a single bat aggroed to me, as I was paying attention to the list of attacking things on the top right though I was too panicked to take a screen shot. (Doing about 15 HHp damage in the first swing, and 45 HHP damage on the second swing which was a killing blow)
After I was dead it proceeded to immediately attack my friend who had also aggroed it until he was ko'ed though it at that point stopped attacking.
I was informed by a mod that this is apparently unintended behavior? SO there is some sort of glitch happening with bats aggroed to two people, or aggroed with an arrow in which one bat will continue attacking a person until he is dead.
((I'd attempt to re-create the glitch but I don't want to die again ha!.... I miss my lp already...))