From the news report, he hit 2 cars and a tree as he was FIRING TOWARDS THE STORE and his wife from a considerable distance, for a pistol. No word on where the fourth round landed. Guy was stupid and dangerous. He put people in more danger than the perps did with their fake gun.
After watching the videos provided on the news multiple times and looking at the scene on a map, I don't think he necessarily put lives in danger. He thought the gun was real and acted with the intention to save a life. The cars were unoccupied, and the tree is probably still alive too! The shooter was at an acute angle to the store and my guess is that the situation looked something like this, where the green dot is the brandishing lady before she fled with her trajectory of flight being the green trail, the light blue dot is her accomplice before she fled with the light blue trail being the motorcycle on the video, and the dark blue dot is the loss prevention guy. The dark blue circled regions are trees and areas where cars could have been hit. It appears to me that he was about 20 yards away from the brandishing lady. The positions of the people is a guess on my part, but it would seem to explain the situation from how it was described.
He missed, but he may have just barely missed (as the news doesn't really provide enough detail to know), and there may not have been any bystanders within his cone of inaccuracy. If hitting inanimate objects is reason to be convicted of a felony, it makes it hard to ever be justified. Statistically, even police will miss more shots than hit. In the same way it is possible at the range to miss a target on your lane without any significant chance of hitting a target on an adjacent lane (for instance, shooting an inch over the shoulder of the silhouette target), one can miss a person without it necessarily being dangerous for a bystander.
Just how it seems to me based on the very limited evidence we have seen presented thus far. The woman also should have known that pulling a fake gun on someone is likely to result in actual bullets being fired. Perhaps she should be billed for the damages caused by the missed projectiles.