Before he got to the hotel, Finn literally using duct tape to mend his wounds. He'd run out of bandages and he'd save up the last role by cutting it into squares, damp the a square in whatever alcohol he'd find, place it on the wound and then keep it there with duct tape. After all, he had to improvise. Demons (whichever type) don't get sick. There are literally no actual medicines in hell.

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