From the inside I might add. The latest trailer for the shooter shows what happens when you get eaten and involves trying to fight your way out. Largely by, let's say hammering at the back door.
Fail, and you'll be digested by stomach acid although by the time you're nose to sphincter I'd imagine there's little that could make you feel worse. Your friends can try and rescue you at least, meaning you've got to be a fairly confident or dedicated monster to open yourself up to attack from inside and out (thanks RPS).