He.. may have wanted to try out a new spell he found in a book, and since he didn't want it to happen to himself, he just summoned you for it! I mean, the hotel wouldn't miss ONE person for their redemption activities for a hour..right?

okay, so whoever created the book was now on alastor's list of demons to kill, because instead of the intended result, a temporarily obedient demon, he has a small, doll sized, very irritated demon looking back at him. He.. accidentally shrunk you, not to the size of something miniscule, just about the size of one of those..Barbie dolls on the market.. And to be honest, he didn't feel like changing you back..also, he didn't know how.. "..Oh- well, this wasn't the intended affect-.." "Are you alright?" From your perspective, he was looming over you..