Three points:
One: The video appears to show that the perp was veering away from the cop when the first shot was fired. Maybe that's true, maybe it's not. That's for a jury to decide.
Two: The video appears to show that the cop continued to fire after the perp had fallen to the ground. It can be argued that the perp was still a danger to the cop. But again, that's for a jury to decide.
Three: The DA claims that the perp's knife was folded into the handle when he was shot. If that's true, a jury will convict in less than an hour.
That's crystal clear in the video. No way McDonald isn't convicted of murder, unless it's an all white jury "sending a message" via jury nullification just like the all black jury did in the OJ Simpson case.
Gee, wouldn't that be something huh?
By the way, why isn't anyone asking all the other police officers that were present and visible in the now FIVE video's that have surfaced if any of them felt like their lives were in danger? They were certainly on the scene much longer than Officer Van Dyke was and none of them opened fire.