http://www.youtube.com/watch?v=IwL0c_k7fB4

Practicing some advanced cuts with left hand leading, so that I can save the targets materials.

The cuts shown in the videos were mostly "turning cuts" (except the one cutting from below to above). They were cuts with feints preceding the actual cuts.

The difficulties lies in several aspects. First, to maintain good blade alignment after a sharp reversal, which is especially difficult with a heavy sword due to the high inertia. Second, to accelerate the blade again after the turn, with the lack of distance and still being able to speed it up enough to cut the targets. Both are especially difficult with a heavy sword.