I was referring to the sequence starting at about the 1:00 mark, until about 1:08 or so.Vader / Reva fight. Seems that Vader is using all of the tools he learned from Ben in the flashbacks. Not needing a lightsaber to fight. Taking her lightsaber when he loses his. She being too eager.. Also, it seems he did stab Reva when she was a youngling and she survived.