But if you hadn't read the books, would it have any impact on you? Go into the no book spoilers thread and they were confused as hell as to what it meant. .
Confused, really?
I mean, only if you overthink it. We've always seen the wolves interact on a higher level with their Starks. They follow commands, come when called, appear to have a protective intuition, etc. Arya says "come with me", wolf ceases her attack, has an eye to eye moment with her, retreats, then Arya says "that's not you" with a smile. I'm just taking that right at face value.
And as for having an impact, I mean, it's a reunion with a long lost friend. Unless they totally forgot season 1, how couldn't you be a bit moved...