The first thing that came to mind when Alice switched to her left hand was: Ryoma!
But I must say, before that scene, the fight was indeed boring - they should have just skipped to the hand-switching scene IMO, since we have already seen how Alice fights with that short-sword of hers. And sadly, it does seem like the ending would leave plenty of things un-answered, particularly what the Silver Wheel plans to achieve by infiltrating Section I (Besides gaining more power), as well as the Invisible 9.