Watched it again, first bull stats into the yes and gets shot, at same time you can see something moving in the trees to the right, then what looks like a non injured bull walks out into opening on the right of trees and Donnie shoots it. Donnie first shot definitely connected with the bull, hind legs dropped, then camera cuts away to the reload. Looks fishy to me.
I would have had 2 round into the bull by the time Cory was even ready to shoot. What's with all the fiddling with the pack and handing rifle off to Donnie, (getting bullets out of pack)?