Gall utilized a Chin Na Tai Chi Chuan technique to set up that knockdown. Now, I am 100% it is a move utilized in BJJ/Wrestling as well when opportunity arises, but that technique is Tai Chi through and through. The #1 problem for Tai Chi has been the last 100 years of McDojos in both east and west that only teach theory or bastardized basics, while over-promising effectiveness without real-world testing. I hope with this maneuver we start to see people taking into account Tai Chi as a strong basis for balance, distance, and standing lock development in MMA. It cannot be the only technique. It shouldn't even be your primary technique. But it is a strong supplement in the aforementioned areas when applied to MMA.