I am very sorry for these people...
I know of several of these accidents. Last year, a farmer not far away from us, tumbled over some rubbish, and fell into the pto shaft of a manure tanker. His arm was catched between the drawbar and PTO shaft, his arm was broken three to four times till his fingers pointed back to his face.
This man struggled for 20 to 25 minutes before his wife got worried at went looking what ook him so long.
The man got his face against the drawbar, this prevented that he would be pulled in further.
The man broke his teeth prothese, not due to the accident but because his strong bite, when he fighted with the pulling PTO.
I think he has recovered now.
My neighbor was in a comparable accident about 30 years ago, but he was VERY lucky: He was operating a pull type excavator with a PTO driven oil pump, loading muck into a spreader.
While he stepped over the drawbar, the PTO grabbed him. He put his hands on his knees, and tried to keep standing upright (i dont think he would be able to tell this story to his children if he was forced to "sit down" on the shaft !!)
Anyway, the tractor was a Ferguson 30 hp, his clothing in the PTO stalled the engine !!!!
Now that's being lucky !!
His feets were pressed about 20 centimeter into the muck at the working area, he said he never was as strong as in that moment... his legs were all red, and he had sore knees and feet for some weeks.