He's either getting in his face because he's a jackass, or because he's scoping out his next target, and when he turned to follow him was when he was planning on engaging.
The two usually go hand in hand but the difference is inconsequential: a totally sober nigger is still a nigger and thus a violent savage that one must be prepared to put down on sight.
My money's on the first option because I couldn't understand a word he was saying.
Also, don't anthropomorphize these animals. You couldn't understand a word *it* was saying.
They're just niggers and they do nigger things and trying to understand it will make you a nigger