I have not viewed that particular video but was aware from other clips of the role of the Hebrew Israelites. The video you shared does not change my view that the boys from Covington were disrespectful toward Mr. Phillips.
I have also read Mr. Sandmann's statement and find his characterization of his role as an attempt to diffuse (hopefully his English teacher will point out that defuse is the word he should have used) the situation to be difficult to reconcile with what I observed on various clips. He really should have stepped aside and let Mr. Phillips go on his way.
Do you think the boys behaved in a respectful manner?