On my first hunt with my .300 Wby, Jason Matzinger's Dad, Tim, videod me shooting a Scimitar Horned Oryx in Texas that flipped over backward. Jason never used that footage on his TV show "Into High Country".
Have had a handful of moose flip over backwards, but that’s because their ass falls while their front legs are stiff and the momentum pulls them over.
Unless you shot that Oryx with a bowling ball, you didn’t flip him over from bullet “energy”.