Harry gained the distinct impression that Snape was suppressing a sneer when he spoke, "Unfortunately for us both, it is that time again - I will see you in my office at six pm. Do not be late," he said coldly, as if Harry was in a habit of being tardy, before sweeping away, his black robes billowing in his wake. Harry watched him go blankly, but dread quickly settled in his stomach, anxiety squeezed at his heart, and fear fried the edges of his awareness. Snape was going to see his neck.