He didn't bury his arms for you Xurts? That's weird. He did it for me immediately. As long as I went into the battle with both characters dead. It worked every time for me. That's weird. And by the way, I did it without the Master Summon matera, so that made it a little harder. You know, my HP went down severaly while my MP went up. Because I had 2 summons attached to Tifa, whom I kept alive for the battle at the beginning. So Ultima did quite a bit of damage to me when I tried using KOTR the first few times I fought Ruby.