FH, if you go back a few posts, you'll see two options for gunnery already mentioned.
As to Major Luce ... his decisions to keep on flying will probably be best addressed after the USAF has finished its accident investigation. I hope he heals from whatever injuries he has sustained in the mishap, and am pleased to note that the V-22 is crashworthy, at least to a certain extent.
Regarding how a bird ends up on its back: lots of ways.