I may be wrong, but I am going to guess that it is more than just moving to another enclosure to feed. Healthy ball pythons have no visible signs of stress from moving enclosures for feeding in my experience, unless something else is very wrong. Many other people think it is a big deal, but there really is no conclusive evidence in my mind on the subject. (This of course assuming that you did not scare the snake as soon as it closed its mouth).