With it being a shoulder injury, first thing I assumed was it was some sort of whip action. Probably didn't think they needed a stuntman for that.That sounds pretty serious.
I hope he recovers quickly as well, but having surgery, regardless of his "fitness", at this age, carries increased risk.
But, yeah. Where the heck was the stuntman? It seems he is taking risks he certainly shouldn't be taking. Unless he tripped on a cable while carrying that big cup of coffee...