Dream I'm the agressor and its someone from Childhood?

I dreamed I was in a elementary clroom (though some of the cl, like my friend behind me, were friends from later times in school) and at some point, I realized that I was for some strange reason, a 21 year old in a cl like that, and suddenly I grabbed this girl from back when I was in elementary school, and started to her, but right before I did, I suddenly blinked and was in an all black room, with a african american man who had skin that was as black as the room, and I was laying on the floor. He told me how disgusting I was and that I should prepare for a brother named Bruce. I told him I only had one brother and somehow he implied that I was going to jail and he was the name of my buddy, if you know what I mean. He gave me the feeling of being an angel, in human form..trying to warn me through a threat. I was in control of this dream up until that part, and I honestly would NEVER do something like this in real life...what does this dream mean?