Guys, guns do not fix all problems.
In this case, someone had inadequate intel, and rather than perform a recon, and gather intel, he chose instead to essentially do a headlong frontal assault.
Personally, I'd have bailed from the vehicle, loaded the long gun, gotten back IN the vehicle, and driven toward them, honking a time or two.
Several things could happen:
They could run. That's fine. You're probably in a catch & release state.
They could freeze. Also fine.
They could turn and wave.
If they start shooting, well, get thee behind the engine block, and return fire from cover.
And I don't know how fast YOU are, but an H1 can whup my butt in the 100 yard dash.