I think his girlfriend urged him to “go kick his ass” and that initiated the fatal ending.
It's not like that hasn't happened before, and I remember reading about a black woman telling her boyfriend in line at I think a fast food restaurant to “kick his ass”, referring to another man in line and it ended up in a fatality.
Gee, idle speculation can bring about all kinds of wild theories!
I’m sure that the police have videotape of Mr.Martin buying Skittles and iced tea. I’m sure they have the times when Mr.Martin and his girlfriend talked on the cell phone.
If Mr.Martin was gone for longer than it took to buy the candy and drink, and he was talking to the girlfriend in Miami the whole time, she knows far more than she has let on publicly. And the police may be aware of that.