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Drew Dober (in Blue) tapped out to this. Seriously impressed how Islam Makachev (Red) could pull this off. reason is because this was NOT textbook head-and-arm choke.
-Red's head is under Blue's left armpit, but Red is in Blue's half guard on Blue's RIGHT. Textbook usually looks like this.
![full](https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Fi.ytimg.com%2Fvi%2F3nbeNMmvF-c%2Fhqdefault.jpg&f=1&nofb=1!
)
The attacker's body is ideally on the outside, on the same side.
Furthermore, Red probably knows he can't get a nice squeeze from that position so he bridged his body up, propping himself with his toes and *really* drive that shoulder on the ground, like he gonna crush somebody windpipe.