This was in SC4, and I think there was already a topic about this on this board?
Buffed SXS B gave Xianghua a free 3B and 66B+K followup on block, which was pretty solid damage.
This also works off of 2B+K and 66BbB for Leixia, with the AA. I wouldn't really advise spending meter afterwards like you do in the video unless you're really close to a Guard Burst or something and have meter to blow. The frame data we have suggests she can land more things but in practice I can't get it to work. Admittedly I didn't try too hard.