I went back and watched it over and over and there is so much going on I can hardly keep track of it and I can back the video up. I can't tell what is happening in front of the center approaching officer but the far officer tackles the aggressive son who is putting his finger in the face of the officer on the far left. Don't know what was happening but all the officers are moving in at that point but they're outnumbered and I'd have tried to stall for time and help. If walmart security guy hadn't joined in it could have been a lot worse for the cops.
Here's a slowed down version with commentary from the chief. I have not watched it (at work) but my brother says it's good and you can tell what's going on better:
