my guess is a death with a grenade or something o.o maybe a direct hit like when those people flip you then instafall and chuck a grenade under you then run for cover while you get you and fly away...
its a flip i guesss,i dont even know but if he got flipped he wont go that high and he cant do a back flip when there r no walls near,and also cant b a gernade cz he's not as strait as in gernade kill..... hmm...i wonder.