Can someone verify whether I've run into a glitch, or point me in a different direction to get around this duel?
I've gotten to Geddoe's chapter 3, and I'm facing off with Duke in North Cavern. The SOB turns effectively invincible during the duel, and I can't make any damage at all to him! I can't get past him by saying I'm not interested in the duel, and if I do duel him I invariably get a game over. I looked at a walkthrough, and it suggests that this duel should be easy, and Geddoe having the advantage! Not true in my experience...
Geddoe's skills are about as high as they can go (Freeze and one other skill are not maxed out, the rest are), his weapon is sharpened to lv 10, I'm reasonably sure his equipment is the best available without serious item/treasure boss grinding... Level 39, on or about. I put the Hunter rune on Geddoe for... no reason at all, really.
I'm playing the game on a EU PS3, in case that matters.
[Edit] Uh, belay that! I actually do deal a little damage - one mark every 5-12 successful attempts. Is Duke really this tough, normally?