Without his magic and with this so-called healer aware of his condition, Sebastian knows just how exposed he is. It doesn't even gall him that the best course of action is to run away and hope that Malfoy comes soon enough to save his life. Reasoning that if he can keep his assailant talking, it might work to stall long enough for help to arrive, Sebastian turns turns to catch sight of his attacker before biting out a muttered and rather shocking obscenity.

"Snape?! Fucking hell," he hisses, pressing his injured hand against his scar more out of habit than for real relief.