In the video, he says that he was about 165 yards from the perpetrator, so I suspect that Vic Stacy (the citizen aiding the under fire policeman) was using a rifle.
It’s more like 65. He was using a pistol at a distance, as confirmed from multiple sources, and the interview (to me) it sounds like he was guesstimating one hundred then decided that 65 was more like it.
No independent confirmation on distance yet, but reports indicate he was firing from the other side of a sort of ‘courtyard’ or central square in the RV Park, so some distance.
No, Mr Stacy was using a. 357 revolver.
He also hit the perp at least three times.
If his claim is verified he should be teaching defensive shooting classes. My hat is off to him regardless.