I tried watching the video several times, my internet is slow so the video is choppy for me.
If they showed a longer video showing the whole warm-up/schooling session I think it would be easier to evaluate. I will say the horse is obviously not scared. I am not condoning the practice of knocking the face down but I do it differently and it is way more effective for me. I prefer to hold the face and use my legs. If that horse is leaning on the bit it usually means he is stuck out or stiff somewhere behind the bit. I will bump one off if he gets a little pushy when I drive him over but I have never been a user of see-sawing.
I DON'T LEAD 'EM AND FEED 'EM, I RIDE 'EM AND SLIDE 'EM.