Crazy or not, that guy is pretty good with the 'chucks.
I remember one of my earlier Martial Arts instructors used to go to batting cages and block the balls with his hands. THAT is nuts. One mistake and you catch one in the chest/face. But I guess that risk provided the motivation for him not to miss.
It was one of those demonstrations where the students watched but did not do.
Martial Artists sometimes do the craziest stuff!