Well right off the bat I will say a couple of things. First, he is a very nice dog with lots of fight drive...of course...
Second, when he first bites, he counters hard and THAT is where he should get re-enforced by slipping the sleeve. Second, I would maybe talk to your helper about how much he is using that stick. It is moving and making noise and becoming too much of an attraction. I have seen dogs start to look for the stick and even try to bite it when helpers use it that much.
The thread about torquing or pulling ...here is an example of a torque. He does it immediately when he first bites, that is fight drive. Looks like at 2:48 the helper finally re-enforces the fight and then after that, when the dog shows lots of power doing it, he lets the dog know he is kicking his ass. That's all good, just that maybe when the dog hits back THAT hard, the helper should just let him have it vs asking for that worthless pulling behavior. All the power is in the fighting behavior, re-enforce it. The last part of the tape is not the best work IMO. The dog counters repeatedly when the stick is used but the helper just keeps waiting for the pulling and ignoring all the power in the dog. The grip is full and he is about taking his arm off but the helper hangs on and when the dog shows far LESS power there by kind of pulling, he slips it. Not my idea of how to build him up.
I like he is barking and looking the helper right in the eyes, That is a very strong dog. Re-enforce his strength don't over-power him by ignoring his power and asking for behaviors he is not offering naturally. When a dog torques like that he is trying to take control and it is up to the helper to teach him that he can . The out and control work will be better with a dog who feels in control and the best way to let the dog know he is, is to re-enforce the power he brings naturally.
People in SchH have lost their minds with this idea of pulling. It makes NO sense, especially with a dog like yours. You can re-enofrce pulling when the helper is turned away but it should not be re-enforced when the helper is facing and actively fighting with the dog. The pulling would be desirable on the escape to stop the helper.