I don't think the OP said their snake was regurgitating... but referring to the somewhat common misconception that a snake that eats a rodent feet first cannot regurgitate it later on(because it would hang up and not slide back out).

It doesn't hurt a snake to eat a rodent backwards, and once eaten, IF the snake needed to regurge for some reason, it is already coated liberally with plenty of slime and will slide back out.