He'd do that classic 'too old to have a snowball fight' move that turns into 'I will murder you with snow' if she manages to nail him, a good time.

As far as revenge goes, he gets it, really. It's not a great way to honor someone's memory, but he knows from experience that it can be practical and satisfying in the right circumstance. Feel free to have a casual fireside chat with him about it, he literally doesn't know what normal people talk about.