How could he exercise his "duty to retreat" if he is on the ground? And after he puts his gun down, it looks like he is trying to move his legs with his hands. Like they're not working 100%.
To be clear, I'm 1000% for the right to defend oneself, with a firearm if necessary. However, there are still rules, laws, principles, whatever on use of deadly force.
I didn't say anything about the guy on the ground was supposed to retreat. My opinion was that what happened wasn't enough in my mind that use of deadly force was obvious. Would other reasonable folks say it was warranted? At least one did and that was the sheriff who apparently didn't pursue charges.
We don't know if the guy who shot was threatening the lady in the car and the guy who shoved him was stopping that threat. Once the guy shoved him, I didn't see any aggressive motions toward the guy on the ground. Did the guy on the ground believe the guy who shoved him was a threat? I would believe definitely. That said, after the guy shoved the guy that fell, the guy who shoved looks like he backed off some.
My initial impression was that the guy who shot was sort of an "angry disabled" type who wanted to tell off the lady who probably was inconsiderately parked in the disabled parking stall and the shooter wanted to tell her off. If that's the case, he started the confrontation. Then the guy who shoved certainly escalated. Was that justified? I don't think so, but I also don't think that in and of itself was justification for the guy on the ground to shoot him in defense. Just my opinion.
On a side note, now that my dad really needs use of the disabled parking stalls and particularly family who help transport him, I get the anger for those who misuse those stalls. However, I'm not going to opening confront anyone.