What do you mean??
I think they mean it leaves the sleeve and goes into the small intestine, where it's supposed to go. If the food is coming out where the staples are, it would be floating around in the abdominal cavity and that's very dangerous. They would need immediate surgery to prevent death. But that is a very very rare complication.
Please note: I AM NOT A DOCTOR. If you want medical advice, talk to your doctor. Whatever I post, there is probably some surgeon or other health care provider somewhere that disagrees with me. If you want to know what your surgeon thinks, then ask him or her. Check out my blog.