The "turning Black" when you get violent is a very fascinating phenomena...
I believe that Blacks are SO deeply connected with violence in our minds, when people want to seem /appear violent or dangerous they literally "act Black".
I'm not saying this is right or good. I think it's quite bizarre.
But it is SO common. It's something people do without thinking. It's like a looking directly into someone's subconscious beliefs.
People don't even know that they are doing it. But soon as people want to seem "scary" they start to act like a Black stereotype.