Except it does justify his actions. That is the literal definition of a justifiable act of self defense. Whether he had a reasonable reaction to external stimuli.
This seems to be something I am discussing frequently, with those who have a differing viewpoint.
There is no purity in being a victim. Waiting until you are down and bleeding out due to someone else’s actions is not the standard for self defense.
This is the natural causative effect of waiting on a criminals mercy. If you follow the comment I link below, be aware that the video is disturbing.
The standard is: Was your reaction to external stimuli reasonable. I do not know whether it is reasonable. I was not there. But neither were you or anyone else.
(RAWR Dinosaurs)