[extended edition; a highly-agitated Karkaroff is following Snape around outside the Yule Ball as he patrols through the carriages parked on the grounds]
Igor Karkaroff
It's happening again, like before, and soon neither you nor anyone else will be able to deny it.
Severus Snape
I've told you already Igor, I see no reason to discuss it.
[notices one carriage that is definitely occupied and blasts the door open with his wand, shooing out the students]
Severus Snape
Lumos! Ten points from Hufflepuff, Fawcett, and the same from Ravenclaw, Stebbins.
Igor Karkaroff
It's a sign, Severus, you know it is.
Igor Karkaroff
Really? Then perhaps you wouldn't mind rolling up your sleeve them, huh?
[reaches for Snape's left arm, which Snape quickly pulls out of his way]
Igor Karkaroff
You don't fool me, Severus. You are scared. Admit it!
Severus Snape
I have nothing to be scared of, Igor. Can you say the same?