Snape was so incredibly irritated by the way Faith almost completely ignored him that he was severely tempted to stomp away in a huff. Seeking to start off in this new area with a little more dignity than that, however, he took a moment to compose himself. Unluckily, it was a moment in which he overheard Faith's greeting to her inked friend. A brief contortion of uncontrollable rage flashed across his face as he turned to confront the insolent young woman he had once 'watched'.
"Do not ever call me by that name! You may act as though you can dismiss me with a thought, but I am not a man with whom one ought to trifle! I could do very unpleasant things you if I so wished. Pray that I do not!"
Glaring at the two young women imperiously, he hoped he was making some impression, at least on the tattooed one. Faith, in his experience, was almost psychotically inconsistent in her reactions to any given situation.