I agree the only time this happens is if the prey gets hungry or thirsty there is nothing else for it to eat in the snakes enclosure except the snake. I have fed live to every snake I have ever owned in the past 20+ years and never had any serious injury. If you buy your feeders at the pet store it would be a good Idea to feed them something before putting them in the cage as you don't know how long its been since it had food. I raise all my own feeders so I know they are well fed before going in. I have even left live small rats in with some of my snakes over night but if I do I put a big piece of tortilla or bread in there for it to eat and I make sure there is water and I have never had an issue but there is a risk any time you leave them in for long periods.