current got-hit-animation?
go into the game
fire at an enemy soldier
notice his twitching when he got hit
player able to fall and get up again:
let yourself be knocked down on multiplayer
or
go into editor
add 1 car and 1 soldier (both playable)
drive the car towards soldier
switch unit shortly before "accident" (slow motion makes it ease)
see how it looks to be knocked down