Dont worry LULZ have a trick for everything: bloom, zombies, assassinations etc.
The moment you hit you move a bit backwards, it may sound hard but its pretty easy to pull off when you have learned it.
That reminds me of one time I was playing rumble-pit: I was AR-AR to another guy and when my shields where almost down, another guy start shooting at him from behind. He turned and I assassinated him(with the assassination where you pull him to the left after killing him) the other guy kept shooting though so the dead body worked as a meat-shield for two seconds.
So when the assassination was finished he had almost no bullets left in his clip, so it was a fast kill for me
Assassinations can also save lives, I would have posted the clip but it was a long time ago and I did not think about it then.