My bp did that when young and learning to kill, but hasn't since. I asked about it with my vet and she said it can be inexperience of youth.. , even just a little over hungry, so on occasion...no problem. I have a corn that most of the time its prey has gone down live even though he squeezes it, just doesn't get it killed. As long as the fight is out of it I haven't been to concerned, but I need to ask about it if too often, or not. And if the prey could do internal damage with claws and such. I will post an answer when I see the vet.

My BP did go through a spell of not eating, would squeeze and release before dead, then leave it. He had a resitory infection, I think it hurt to squeeze. But he also didn't eat. Long as yours eating that's probably not related, but if it goes off its feed, then this is something to think about. Good Luck. Joannarea.