I haven't heard where the rounds landed, other than the one that struck the girl.
Yes, there's no question about the velocity and energy of a round out of an AR,
but in a department store? Maybe if the perp was armed with a firearm and is
threatening to or already shooting. But with a bicycle chain? If it was a lock chain,
it probably even had a plastic cover on it. Unless the perp was assaulting someone,
he needn't shoot, and even then, not without identifying himself.
I'm not anti law enforcement. I'm anti idiot with a firearm That includes law enforcement.