Lets talk about Zimmerman a bit.
Several months before, he had assaulted a police officer. He said at the time he did not know the plain clothes officer was a police officer, but that points to a problem not figuring things out before turning to violence.
He goes up and down severely and quickly in muscle mass. That is not possible that quickly without using (and going off) massive amounts of steroids. He has repeatedly refused any drug tests, for obvious reasons. That helps explain attacking a police officer, and the numerous other violent attacks of his.
The night before, Zimmerman attacked his wife. His wife was the one who earned all the money, and his roid rage was not OK with that. She fled to her parents house, and he went "out on patrol" at night.
Zimmerman was extremely paranoid when he went "out on patrol", and was known to threaten people he does not like. For instance, he threatened a 12 year old child for always walking down the street at 3:30 pm... The kid was returning from school.
Zimmerman has since the incident attacked several people. He attacked his wife a few times, and her family twice. He has threatened police with guns on at least two times. He goes back and forth from steroid use to not steroid use and it is very dangerous.