My hunting days are long over. I can tell you a horse can't hold a bull elk. A mountain lion will run right back up the rope & on the horse & guarantee a horse doesn't like that. So much for that. I took a day off yesterday & got in a couple hours or so of nice trail riding. Wonderful day.
I read a first hand account of a man that helped gather a herd of Tule elk in California in the 1920's. Many of them were roped and tied down for transport. Unfortunately none of them survived the trip. I would say it's quite possible that a horse could hold an elk however it may not do the elk any favors.