Seen that happen around here quite a few times. My fences have several crossed top wires at any given time but most of the time they are able to pull out and keep going. But, as above, not always. I had a doe cross the road in front of me one time and got hung up as she jumped the fence. I stopped and tried to explain to her I was just there to help but she didn't seem to believe me. After a few kicked shin bones I was able to send her on her way. She didn't even slow down to say thanks.