Karkaroff intends to flee if the Mark burns."
"Does he?" said Dumbledore softly, as Fleur Delacour and Roger Davies came giggling in from the grounds. "And are you tempted to join him?"
"No," said Snape, his black eyes on Fleur's and Roger's retreating figures. "I am not such a coward."
"No," agreed Dumbledore. You are a braver man by far than Igot Karkaroff. You know, I sometimes think we Sort too soon..."
He walked away, leaving Snape looking stricken.

Autore: J.K. Rowling