I just found this out I was messing around in Ashenvale.
I tryed to kill Astranaars flight master.
Just follow the pic, and the 1,2,3 and 4
When you jump in water, her mobs just look at you, but she jumps in the water with you (grrrr ), so u can try to kill her, but when she have 5-10% hp left, she run out of the water and up on the coast, and just runs around. And after 5 mins, she is long gone