He actually ate one in the Yair fight, seconds before the 1st or 2nd round ended but it was not that impactful. It just busted his lip.
I think with Brian's new found confidence, he won't mind trading shots in there with Yair. He can throw variety of attacks without worrying to get it on the ground, which I think if he should win, it's by mixing it up, closing the distance and use his grappling and submit him on the ground. He doesn't wanna stand and bang in there with Yair that much. Yair is still a lethal striker.