This is an extremely rare situation in which a black belt chokes out another black belt from inside his opponent’s guard.
He uses an Ezekiel choke. The one with the white Gi is 2014 Europeans black belt adult middle heavy champion Thiago Sa Silva. Do you know the name of the other BJJ player in the blue Gi?
The set up starts from half guard then transitions to full guard, but the choke is already fully locked on.
The move starts at 4:17