Happens more often than folks think. We’ve owned horses our whole lives and the things they do and die over never cease to amaze.I knew a guy who borrowed a horse , brought him out to Montana from Wisconsin.
Lost horse, saddle, rifle.
Was never found, at least not reported found.
I suspect, since it didn't have mountain experience, it got itself hung up in some nasty stuff and dies.
Had to be a bit uncomfortable making the call to the owner.