Ugh, RESPONSIBLITY.
Sebastien would like to register a serious (and unregisterable, due to the whole 'we'll get our dumb asses in trouble' thing) fault in the Gooseberry library collection. There was a serious, lamentable, and frankly concerning lack in definitive answers on the 'anti-possession sigils and symbols' front in the available selection of prose.
Moments like this were the ones where he deeply resented the lack of internet access.
And the fact that about 99.8% of his occult knowledge came from really shitty CCD classes and repeated viewings of The Exorcist, The Evil Dead, and a disturbing amount of episodes of Supernatural.
He had a couple things scribbled out in a notebook (some gems included: fucking winchesters, what the fuck even is your tattoo? what bitch invented this? is this even remotely legit? hexagram of solomon? [a neatly drawn diagram] does this only work for nice, abrahamic ghosts? fuck, we need more books.) But mostly he was relying on the power of neuroticism and wholly nonthreatening scowling to win out in this battle thing.
Dude, he seriously hoped this didn't end in a battle-thing.