Based on the interviews presented by Johnson - there are three different retellings of the story.
In one account Johnson says that the officer drove past, then reversed back to them, attempted to open his door but the door bounced off Brown and closed on him.
In another one Johnson skips the whole reverse and almost hitting them part, and says that they had their conversation and then the officer tried to 'thrust' the door open but there wasn't room.
In one of the account, Brown was being choked through the window by the officer, who after a struggle, pulled his gun, said "I'll shoot you," then fired his gun inside the vehicle.
In another account, Brown was being choked through the window by the officer, who drew his gun, said "I'll shoot you' and immediately shot, Brown was bleeding.
In another, the officer first said "I'll shoot you," then said "I'm gonna shoot you," then the officer fired, and Brown was bleeding.
In one of the accounts Brown and Johnson then started running, but, upon feeling a second bullet hit him, Brown told Johnson to keep running then turned around, putting his hands in the air and saying he was unarmed.
In another, Johnson hid behind a car with screaming people in it and watched the officer shoot Brown, who was on his knees with his hands in the air.
Brown was then shot an additional four, or six times (depending on which retelling.)
Now I'm not going to argue that Johnson is necessarily making those changes because he is lying, he could very well be doing it subconsciously as that is a common function of memory writing and recall - but the end result is the same, his testimony 'is' changing with every interview so it's 'creditability' is losing face. Should stop retelling it now - three interviews is more than enough.
That said, I have some questions:
1) Did the police get Johnson's account of the incident at the scene or did he immediately flee the scene? If Johnson did flee the scene, that's a bit unfortunate for the validity of his account. (Not that if his story is true, I would blame him one bit for fleeing a bat shit crazy officer that just executed his buddy.) If he didn't flee, and they do have his report then what caused him to no longer be in fear for his life after watching his friend get executed?
2) Johnson says the officer reached out the window and started choking Brown, and that Brown was 'struggling' back and forth with the officer trying to get away. Then the officer either shot Brown, or discharged his weapon in the car, and they both ran. So I'm trying to picture this: the officer is choking Brown through the window with one hand [else the officer would not be able to draw his gun.] First I'm going to say that Brown looks pretty big to me - say 6 foot, though a bit overweight perhaps rather than muscle. Now if Brown wasn't strong enough to get away from the officers one-handed choking BEFORE he was shot, how did he manage to get away from it AFTER being shot? I would think that being shot would weaken you wouldn't it? I mean adrenalin sure, but Brown's already being choked according to Johnson, so that effect was already in play.
3) I've never been shot, but I imagine it hurts like hell, so I'm having a difficult time understanding how one could get shot twice and not fall to the ground in pain; much less have the coherency to tell a buddy to keep running, kneel, and put my hands above my head saying I was unarmed. I mean I've heard of people getting shot repeatedly while on drugs and they keep going, but I've never heard of something like this where there is basically no indication of this young man getting shot twice in the telling's [other than the blood.]