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Time for a mysterious roll. Well, not all that mysterious for those with the right sourcebooks, but I'd rather not tell the players everything if I can avoid it. Anyway, I tweaked the rules a bit to give Leon a fighting chance.
[roll2]
Leon may oppose this with a straight Resolve test. If he rolls more successes than Gregory, he may either break the hypnosis and do whatever he likes, or pretend to be hypnotized and lie. If he loses the contested roll, he must answer truthfully (the full truth, no half-truths or deceptive wordings, as his mind is too overwhelmed for trickery). If it's a tie, we will re-roll.
Edit: Epic fail for Gregory, but Leon must still roll Resolve, as we may have a tie.