This is a very good question... *BUMP*
I usually try to keep my xhair on the opponent during a swing.
Before a swing, there's a windup that requires you to aim a little to the side of the opponent, which means you have to manuever your xhair a little bit.
It would be vital information if we knew that the CSC's effects started at the swing instead of contact with an opponent's saber.
Artifex, where are joo?