Hang, there's too much **** going on to judge a situation like that in those 4 or 5 lines.
Like for instance, did he break his hip while on the job?
I believe in worker's comp, but it definately shouldn't be full pay. In my company, anyone who gets really hurt will be transferred to some less strenuous job, but they will still earn their keep. That is unless the accident and injury happened because of full incompetance of the owner / boss.
If your plumber friend broke his hip outside of the job, I'd tell him he'd have his same job and status waiting for when he got back, but I wouldn't pay him a cent. Of course I'd offer a lesser job.