I dont see the problem. The one kid was standing pretty close to the drummer but you couldnt tell who got close to the other first.
The drummer and his fellow protestors approached the group of young men. The kids basically stood still, a few moved forward slightly on the sides of the group to get a better view.
Apparently the leftists who are complaining about the whole thing are upset that the kids had MAGA hats on, and just stood there smiling. The leftists are also pretending that they are "outraged" because some of the kids sang along, or otherwise seemed to enjoy the singing. Apparently to the leftists now the song of the American Indian Movement protestors is something sacred.
And we all know leftists never disrupt any performance, or speech, or religious service. /s