There's two things to consider here: rules of engagement and reasonable suspicion.
The #1 reason why this kid is going to get a nice fat check in court is the fact that the cop did not have reasonable suspicion to approach him in the first place. In court, a cop has to provide facts to support the decision to detain in the first place. Right now, there's only a phone call about someone "looking suspicious". So the police officer is going to have to prove that he had reasonable suspicion...of someone being suspicious. Which is so absurd it's almost comedy. The fact that he engaged the kid walking to the bus stop and not actually at the bank is the kicker. He himself didn't even witness the kids at the place where they were reported to be suspicious at. He had a physical profile, and was going to pull up on them wherever. Keep in mind this happened 3 blocks away from the bank.
And the bigger deal is rules of engagement, if the courts decide that the cops did not follow protocol for approaching someone who hasn't been accused or under suspicion of a crime...it's a wrap. If they really did hop the curb almost hitting him, and/or a weapon was drawn...the kid running becomes a moot point.