Sorry to rain on your parade, but I'd say it'd be more to do with what his sword is made out of. Remember when he tried using a random sword he found to attack it and it shattered before he used Longclaw?
Ah ya my girlfriend said that too, and I thought she was just confusing that with the bald dude who had his axe shattered. So it IS the valyrian steel that did it. I still say John Snow is a Targaryan...and so it another little guy we all love.
