That's missile talk, irrelevant in a close-in knife fight like this one. Eyeballs, Gs, and trigger fingers. Probably more like a mugging than a true fight. If the OV10 had any air-to-air capable armament, he didn't seem to show any interest in going offensive. I think he was playing this as a game of "footsie" rather than a lethal fight.random flitting from a target below and close to the clutter would be hard to track and launch, it seems to my non-pilot thinking.
I saw a piece of WWII battleship armor up at the GE test range that had received a one second + or - burst from a Vulcan at a range of several hundred yards. A roughly bowl shaped hole about one foot in diameter had been blasted out of the front surface, shrinking down to about a five inch penetration of the rear surface. The ground around was littered with steel spinters and shrapnel. Ball, AP, HE, and Incendiary rounds at the rate of 6,000/min defy the imagination. Probably only a fraction of the rounds in that brief burst hit the Bronco, but you saw the results.