You probably hit his pilot and he blacked out during the maneuver and was pilot killed.
I would wager that, or perhaps a real big pocket of lag, if it was only seconds after you shot him up (the lag would also explain some

maneuvers). He might of also bailed or DCed.
I've never seen in AH, other than augering or destroying yourself within your own blast radius of ord (or with KS on) where a pilot can instantly destroy their own plane through their own actions (tear it in half though, sure, but then you'd see the pieces falling to earth).