Technically it's the whole change of the substance of the Eucharist which is some sneaky wordplay. It's even specifically stated the outward characteristics remain unchanged so it's metaphorical ritualistic cannibalism at most, and even that is a reductive surface level misunderstanding. Any catholic would think you're kinda dumb for thinking the communion is even related to cannibalism. It's not considered actual flesh and blood, it's magic bread and wine that's magically infused with divinity so when you eat and drink it you more or less reswear your allegiance to the J-dog and his socialist ways. Don't get me wrong, it's all still bonkers dumb and logically inconsistent but no catholic theologian will take seriously the claim that it's actual flesh and actual blood.