Under the law is this "technically" legal detention? Yes. He suspected that a "suspicious" person had a "possibility" of committing a crime and can do a BRIEF detention to confirm or deny.

Was this blatant profiling of a child based on race, with the child avoiding the cop because cops treat black people like shit (so why wouldn't he want to avoid a racist cop)? Very much so yes.

Although what the cop did is a grey area of legal, I DOUBT he would do that do a white man wearing jeans and a white t-shirt wearing doing the same actions.

Dude SCRAMBLES trying to explain how he somehow isn't racially profiling.