Last week Bob took a quick trip with a sudden stop down a flight of stairs. Initially it was feared he had broken his back but as the swelling goes down we know that's not the case. Still, he doesn't have full use his left arm and while his right hand has a strong grip the arm is a source of pain. He's mobile though, so the worst case scenarios don't appear likely.
Per your custom, prayers or well wishes are welcomed. He will have a long convalescence which is always difficult for someone used to being active. Get well soon Bob.