Your summoning spell causes chocolate and a calming draught to appear from your dorm. Clever. Only... How to convince the man this will actually help him?

As of right now, he keeps moving away from you, crouched or not. "Hit my head...? I know what I saw. And I know... What I felt..." His eyes suddenly shiny as his gaze flickers away from you.

Yes, the man is affected by the attack of the dementor. An attack one might never forget. "... And then those white creatures. Your white creatures." He whimpers again and hides his face in his hands.

Well, this is getting you nowhere. Better find a way to complete your plan with the chocolate and the calming draught.

Who knows how long your protecting spells will stay in place...