Did we just miss what the news has reported, or are we so tied up in defending one states' law as applied to another state that we don't care?
Where does it say that the old boy brandished the weapon prior to the thief voluntarily stopping? He was following the thief, and made no attempt to interfere with him. It was the thief who was running at high speeds, and it was the thief who did so with a child on board. Nobody mentioned "blowing anyone away". NOBODY. The elder man's question was on the legality of shooting out a tire. He obviously didn't do that, either.
In the end, this entire line of discussion has left the factual, and is tending into the fantasy. Many states DO NOT HAVE a "standard to retreat". In most states the principal of the "Citizen's Arrest" exists, and in a few, the citizen may act in an agressive manner to implement the arrest. It would have behooved us all to research the existing law of the jurisdiction, make comment based on those laws, and have ignored the laws of where we live.
In the end, the old man chased a thief, and showed a weapon to him after the man voluntarily stopped. Picture the response if that had been a sworn officer who witnessed the same action. He would have approached the vehicle with gun drawn, while his multiple back-ups roared up, and also rushed the car with weapons drawn. All over "$5.00 worth of gas". Everyone would have been ordered from the vehicle at gunpoint, including the child, searched, cuffed, and taken away via cruiser. Somehow, the old man's actions seem almost peaceful compared to that. Please don't tell me that, after a high speed chase, the take-down wouldn't have been a felony stop, either.
So, shall we deal with the facts of the case?