Interrupting stomachs are terrifying adversaries when your master is a seasoned practitioner of elder magic. This could very well have been an interrupting zombie stomach, autonomous and detached from any living body, animated through eldritch rituals with dark entities from beyond our comprehension of the universe. It could have been a very serious threat. 

As it stands, this interrupting stomach belongs not to an eldritch abomination, but to something even more terrifying; a female.