From my experience, if you feed your BP multiples, ie 2 or more prey in one session, that they tend to get aggressive until they are settled down and digesting.

It's not a bad thing, it just means that they are in hunt/devour mode because they know there is a possibility for more food.

My one female was hanging halfway out the tub after me when I added her second rat the other day. I guess I was a bigger tastier meal than the rat




As far as letting go, the only time I was bit the snake let go right away as well, it was more of a strike... wait... something wrong... let go. It makes sense that they can detect something wrong right away, because normally when they strike they wrap right up around the prey.