Jon was fourteen, an old hand at justice.....

...."The deserter died bravely," Robb said. He was big and broad and growing every day, with his mothers colouring, the fair skin, red-brown hair, and blue eyes of the Tullys of Riverrun. "He had courage, at the least."

"No," Jon Snow said quietly. "It was not courage. This was one was dead of fear. You could see it in his eyes, Stark." Jon's eyes were a grey so dark they seemed almost black, but there was little they did not see. He was of an age with Robb, but they did not look alike. Jon was slender where Robb was muscular, dark where Robb was fair, graceful and quick where his half brother was strong and fast.

Robb was not impressed. "The Others take his eyes," he swore. "He died well. Race you to the bridge?"

"A Game of Thrones" by George RR Martin (pg 15)

God I love this series of books. Rereading for the umpteenth time. :) This is sort of the "race you to the bridge?" moment between the two half brothers.