Severus bristled at that comment, complete to the hairs on the back of his neck standing up. "No." He looked hard at James and suddenly saw Harry; the resemblance between them really was uncanny. And the line that separated what he was suppose to know and what he had already lived further blurred. And Severus was so lost in how much he despised both James and his son, feelings that he had to keep locked away most of the time, for Lily's sake, for history's sake, for his own sake, he could very well have been staring down Harry in a 1994 potions classroom, while also sitting here being questioned by a marked, not soon enough dead man.
"But aside from that," Severus answered coldly. He was trying to keep the hatred out of his voice, and managed instead to merely sound condescending. "The quality of the knowledge you have to impart is the important aspect in being a professor."