Board Thread:General Discussion/@comment-27350660-20160330094943/@comment-26397825-20160330114943

Well, I would assume that when duelling another rapier-user, that style would allow you to quickly slip your rapier underneath their blade and flip it up, possibly even disarming the opponent very quickly and easily. The hand movements would be very quick and precise, and it would be an easy form to follow on into an actual attack once you have opened the guard of the opponent.

Of course, that's just an assumption based on the very little I know of rapier use and an active imagination on how that stance may come in handy.