DONT CALL ME COWARD

Harry had dived for his wand; Snape shot a hex at it and it flew feet away into the darkness and out of sight.

"Kill me then," panted Harry, who felt no fear at all, but only rage and contempt. "Kill me like you killed him, you coward -"

"DON'T -" screamed Snape, and his face was suddenly demented, inhuman, as though he was in as much pain as the yelping, howling dog stuck in the burning house behind them - "DONT CALL ME COWARD!"

And he slashed at the air: Harry felt a white-hot, whiplike something hit him across the face and was slammed backward into the ground.