I feel so bad for him!!
Just yesterday I worried about that injury, I was watching farming videos with PTO shafts exposed. Please make sure guards are in place. I remember my grandma made a guard from pvc tube. A neighbor was killed by a PTO shaft.
Please, I ask all people who deal with mechanical equipment, please take the wedding ring off and NEVER put it back on. Leave it in the jewelry box. I never wear mine. My wife is ok with that. I know of many stories where people got hurt.
A buddy of mine had to be rushed to ER to cut of his ring when it got bent tight on his finger. A guy I knew lost his finger jumping down in a hay barn - a steel nail snagged the ring.
Be safe. Another friend I know, he tattooed his ring so to be able to not wear his ring. Luckily my wife doesn't require that.