This is Morihiro Saito Sensei in action. Please, note that during the last part of it, filmed on 2001, Sensei was ill with cancer, and could barely move. Even in those conditions, you can feel the martiality of one of the great masters of all time.
I wish I would have been able to train with him. Fortunately, his legacy is still alive in Iwama Ryu, in all of his uchi and soto deshi. I'm fortunate enough to train with one of them, Daniel Toutain Sensei, at least once a year.