if you look at the video in quarter speed (in youtube in the cog setting in bottom right of vid u can slow it down) you can clearly see him tag the tail twice but it is not enough to snap the tail. if you go frame by frame you can
see after both contacts the tail is intact. also.. for those that fly a-stars we all know how strong that stinger is. if you go frame by frame it looks like the tail and TR are intact but there is such a strong forward cyclic correction that it gets into an extreme nose down attitude and may have had a MR stike? look at the video in slow mo and see what u see. i orig thought it was the TR becoming inop from the strike and that causing the spin but really doesn't look like it when viewed in slow-mo.