They may have let you go. Black rage isn't all it's cracked up to be. I suspect a lot of blacks go along with the whole "hate whitey" meme, but their hearts aren't in it. They felt social pressure to mug a cracker, but most of them probably have white friends, and have been treated decently by white people, so it was some sort of perverse right (or actually wrong) of passage. Glad no one got hurt, but it's nonsense and bullshit and people, white and black, do get hurt like that.
Yeah, plus I was wisecracking. ‘Hey! Hey! Its me! Steve Motel. Come on fellas!’ I knew they were sporting around. If one of them was a psycho the whole thing would have gone bad and your old Pappy wouldn’t be here to tell the tale.
It sounds like the young Marxist in the story just went limp and let the holdup crew paw him over for valuables.