I wouldn't even be concerned, it was just a snake in feeding mode at a completely appropriate time. Hungry snakes are usually waiting at the door ready to grab, this is why it's safest to feed in the enclosure and also why we use tongs. If he's in feed mode when he shouldn't be a squirt of water, tap with a hook or your hand on his side will probably be more than enough to break him out of it. I have snakes that come flying out of the enclosures, ones that hit food very fast and aggressive off tongs and some that will only grab dead food on their own terms very methodically. Some that are fussy. The poorer/slower feeders are the worst temperamentally at my house.