I really like the right swing in duel.
With a fast (101+ speed) thrustable one-hander, you can face your left side towards a player, oscillate between thrusts and right swings a couple times (which just looks like you are wiggling a thrust), and then bring your right swing in hard for full damage and max speed bonus. It's not nearly as good as the equivalent 2h feint (and is probably worse than the thrust-left-thrust and overhead-left-overhead feints), but it seems to catch people off guard occasionally.
Feints aside, with decent ath or a long 1h the right swing makes for a powerful range-game option against players who underestimate its reach.