I didn't see any "shooting back or attempts at shooting back" but since the CENSORS have now removed the video I cannot verify that.
If he was actively trying to shoot back thats a different story but you are NOT JUSTIFIED to shoot anyone in the back when they are fleeing (my interpretation of what I saw in the video) and call that self defense.
Since we can't discuss the video anymore because it's gone..
What do you think about it's censorship?