Your timeline is a bit off, I think. As I understand it.
1. Kids were told to gather at the monument at a certain after having free time to sightsee in the city in smaller groups. Some arrived early like the ones in the video. They were not protesting anything, didn't need a permit, they are there to meet the bus and go home.
2. Black Hebrew Israelites, all grown men, I might add, note a bunch of white teens and proceed to insult and harass them, while recording, apparently hoping to goad the young men into a physical confrontation. Including such hits as "You are all school shooters, all incest kids", and telling the one young black men with them that his white friends will kill him to harvest his organs.
3. This is when things stand when the native strides in. What I read was that he thought that the white teens were harassing the black men, and thought to deescalate. Whatever his motive, he placed himself in between the two groups, and could have walked back out from between them at any time, contrary to what he says now.
You are correct...I had the sequence of the two events reversed in previous post.