The Defender Didn't Need to Fire a Shot

The Bad Guy showed up with a gun, and the bad guy ran. Armed Suspect Robs Victims In Their Yard, Shots Fired: New Haven Police | New Haven, CT Patch

He showed up in a backyard, and tried to rob people who were outside the home.

When another resident of the house saw what was happening on their surveillance camera, he went outside with his own legally registered gun to challenge the suspect, who then fired two shots before fleeing on foot, police said.

No one was hit by gunfire.

Police arrested someone who was wearing the same clothing, at a nearby store the next day. He was detained, and searched. It was discovered that he had a gun.

[He] is charged with interfering with an officer, carrying a pistol or revolver without a permit, criminal possession of a firearm/ammunition, illegal possession of a controlled substance, and stealing a firearm.

The investigation is in early days. It still sounds like Good Guys 1, Bad Guys 0.