My Ball Python did that when he was smaller and I didn't see any reason to be concerned. He didn't seem to have any problems.

When he got bigger...meaning larger feeders, he took a couple of them sideways. One time he was not able to take it down and ended up throwing it up after about 3 hours of trying.

Now that we are feeding him rats, I get really concerned if he tries to take it backwards cause the nails seem to be quite a bit longer than on a mouse. I am just really careful to present the head to him. Even though I am careful with that, he has had one or two from the butt and no problems to date.