Oh man what a great part lol. I love that movie, and that part is one of my favorite moments in it. It's one of those times when you realize that you REALLY shouldn't threaten the loved ones of the nice guy... especially if that nice guy has been training hardcore to kill Vader and has some dark side tendencies to begin with.
I've always thought that was the most emotionally-charged duel in any of the films. Yeah, ROTS duels were well choreographed and artfully done, but there was a lot of spirit in the ROTJ fight.
Anyway, I'm getting off-track. xD