The Mountain is hopefully dead anyway. As much as I'd love for The Hound to get one back on him, Prince Oberyn is a master of poisons (episode 3), we see that squire wiping his blades probably laced with the stuff - that and Arya giving the mention to a true killer would happily use poison just earlier on. But I guess the law only counts who gets killed first, so.
What was with Sansa in that last shot of hers - completely black, even her hair? Please tell me she hasn't dyed it what the hell. They make a point of her hair standing out so vividly in scenes like that snow castle, I guess this is her being portrayed as no longer a girl but some player too - given her testimonial.