I read the warrant and the one thing that jumped out at me was the statement that the shootee was over 10 feet away from the shooter. The access aisle (hashmarks on the ground) is 5 feet wide, and in looking at the video unless the shootee is 12 feet tall I find it hard to believe he was > 10 feet away. One fatal flaw in the warrant which points to possibly even more problems with it.
I watched the video again, and I have to agree. I'd put the distance at more like 6 feet, certainly not "over 10 feet."
Distance aside, IMHO you can't overlook the factor of time. We get to watch a video, slow it down, rewind, play it again, and analyze it until we're cross-eyed. Drejka didn't have the benefit of instant replay. The shove was at 0:18. From 0:18 to 0:21, Drejka was falling and rolling on the ground, and McGlockton was advancing. At 0:21, Drejka apparently starts to draw and McGlockton stops advancing. The shot(s) was (were) at 0:23 to 0:24.
So in the span of five seconds Drejka's universe switched from being in a verbal argument with a woman to rolling on the ground and having shot a man, purportedly in self defense. That's just not a lot of time in which to process "Hey! WTF just happened here?"