He might have been running away since he was hit in the back...
Otzi was a tough dude. The pack train was pretty well scattered all over the trail and the battle was far from quick. A man had to be tough to be a trader over the Alps and live as long as he did.
This is actually old news, and there have been more research findings released.
According to DNA evidence from Otzi there was much more of a fight than they suspected..
Otzi had severe bruising on his ribs probably from some kind of club. He had defensive cuts on his hands as one would find in a knife fight. His own knife had blood on it from someone other than Otzi, and his grass cape had yet another individual’s blood on it. Further, two of his arrow heads had blood from two other people, and they must have been fatal shots since he retrieved the arrows.
My guess is that he was in some sort of raid or battle, his side lost and retreated up the mountain, with Otzi perhaps carrying a wounded comrade. He was pursued, shot, but lasted long enough to hide and was frozen.
He was in a border region between Italy and Austria.
But I doubt if he was Bush-wacked. They had no immigration laws back then, so he wasn’t a minute-man.