I actually kinda liked that moment. I always find it interesting when the relationship between old enemies is explored. In a way, each knows the other better than anyone else - you hold back around the ones you love, but with the ones you HATE, you open up like a sunflower and show them - PUMMEL them with, in fact - the real you. They've each taken advantage of each other's weaknesses and seen each other's strengths. Sure, they hate each other, but in a twisted sort of way, they're almost friends, and every now and then this is acknowledged - and it's always interesting when it is.