In the CCTV footage, MB grabbed the clerk by the neck, forcibly stealing property, according to the Missouri criminal code.
MB committed a class B felony.
Robbery in the second degree.
569.030. 1. A person commits the crime of robbery in the second degree when he forcibly steals property.
2. Robbery in the second degree is a class B felony.
http://www.moga.mo.gov/statutes/C500-599/5690000030.HTM
MB's family, friends, and defenders can try to minimize his criminal actions all day long and they can try to vilify LE for releasing the CCTV footage, but the fact of the matter is: MB assaulted someone during the commission of a crime.
It doesn't matter that his act of violence during the commission of a crime was momentary - it was still violence. MB violently grabbed the clerk by the neck and pushed him.
Hmmmm... Now that I think about it, I wonder if MB's violent actions against the store clerk may have been the inspiration for Dorian Johnson's claim that the officer grabbed MB by the neck during the through-the-window altercation?