So I noticed this when the update dropped, and only now managed to get a photo of it. Whenever you win a fight, a bronze brass knuckles appears on each side of the screen, as so:
I believe this is the consequence of how the Sekhmet Return, Hype Mode, and Squigly Charge are all similar to...
I was playing Valentine in a prize fight. I decided to use checkmate incision, but the enemy big band used brass knuckles at the same time, and it didn't hurt me or even push me back. It's not like I had Unflinching, I didn't, and neither did he. iPad Pro.