I don't like seeing fights unless it's part of a competition - controlled - or self defense. Organised street fights such as this are the work of fools. What if you hit him in some way and he fell and hit his head, and then died? You'd be put in prison because you couldn't claim it was self defense, you clearly walked into that fight because you wanted to look cool in front of your friends. You claim he was talking (edit). So what? Don't you have any self control at all?
Clearly you dont know the situation, the guy was saying how he knocked him out before and that he would do it again, and before that fight he sucker punched him.
Who cares what he was saying? Walk away. I watched the video and obviously Samuel wanted to fight him, there was no self defense in that. The other guy might have punched him earlier but that was earlier, therefore no longer relevant.