I found a bug but idk if it's Kasumi only. If she hits this barrier and then at a certain angle hits the middle empty part separating the other barrier from it, it'll cause the barrier to then cause the second full break stun animation that leaves them in that sit down stun but the barrier won't fully break and it'll remain half broken the entire time unless you restart the stage with a new set or reset the training mode, but the others seem to break normally.