Most of it can only be seen from the opposite direction.
1. Uke: brings his body in line with Tori´s body and pushes Tori´s right knee to the rear (in Uke´s overhead-direction) and twists his body to the left and pushes with his left hand against Tori´s neck in order to roll Tori to the right.
---> Tori: draws back his right leg and switches to kesa-gatame-position, using his left leg to avoid being side-rolled. Doing this he cannot avoid lifting his head a little bit.
2. Uke: realizes, that he cannot roll Tori, so he tries to twist under Tori´s body. So he changes the position of his left hand, which was pushing against Tori´s neck, and brings it under Tori´s throat trying to create more space between him and Tori, still twisting his body to the right, but - that´s the difference - not trying to roll with Tori, but under him.
---> Tori: switches his feet again, holding his head down and moving a little bit to the right to block Uke´s twisting motion.
3. Uke: realizes, that he will fail, so he tries to utilize Tori´s blocking action. He changes the grip of the left hand again and tries to pull Tori to the left and roll him over.
Please watch carefully Uke´s left hand. Then you can see the different attempts.
From 8:30 it ist explained, but the first escape (rolling ist only shown once - a problem of coordination of explanation and demonstration, when one is speaking in a foraign language....).