Since I'm a great imaginatore, I have at least a few combinations of what could happen if things went wrong, one of them would be if it possessed a being from my imagination known as Commander Charge, he is from a race that are shape shifting cyborgs known as a Changeling, the Changelings' main forms are humanish, any form he takes, he retains all of the abilities of the creatures form, now if the demon possessed him, that demon would truly die instead of being captured, for Charge is not an easy opponent