[MamaTexan]

when the description of Brown and Johnson doing the robbery came in, and he looked in rear view mirror and realized that was the robbers, so he started backing up.

Nice job! Your post fits all facts as I've seen them.

The part that I couldn't figure out was why the officer backed up, but it would make sense if it wasn't until after the initial contact that he heard the description.

[Kackikat]

There was the friend who said he saw cigars in Michael Brown’s hands, but I believe it was the description...How many 292 lb, 6’ 4” young black males could there have been on the scene?

The officer was still in his car when descritions and robbery came in, so he heard it all, looked in rear view mirror and realized he was looking right at them.