"No, no, no, not percussion, percussive, though they do share the same root word..." Mercifully, Martin stops himself from going full Teacher Mode and getting off the subject there. "What I'm trying to say is that we need a tool to hit the ice hard enough to smash it. Your sword should work admirably, I think." And he sits down on the floor, the better to comfortably lean his head back against some of that ice. "I'll try to soften it up a bit, and then you can take a literal whack at it."