I think this is right. You can stop a video at any time and make it imply what happened before and what might happen after. But seeing the video in motion tells the complete story. I don’t think that was a surrender. It seemed like more of a reactive pause and then resumption. Then there’s the post where one of his friends claimed he said he wished he hadn’t hesitated and shot him.This... looking for the video again... my first impression was a "startle reflex" from the shot going off that struck skateboarder dude, not a "surrender"... then an immediate resumption.
The still image that looks like a hands-ups surrender was an instant only during that startle reflex at the sound of the gunshot, IMO.
Looking for the video again to re-evaluate...