After the robber fled he was shot at by the good Samartians. Sounds like the writer wanted to make the Felon out to be a victum at that point in the story.
Not being there I could assume the robber pointed the gun at them as they chased him, thus causing them to protect themselves.
The robber was captured by LE so I can assume they the LEO's that arrived know who the good guys are.
One point for the good guys for coming to the aid of a citizen in distress!
"As an OK State Trooper once told me, "Why shouldn't a "good" citizen be allowed to carry a gun, all the "bad" guys already do.""
Certified Glock Armorer