The driver in the situation you just described should absolutely, even in a "stand your ground" state, leave the altercation if possible.
In my opinion there is no reason to escalate to the point of violence IF you can safely leave the location and diffuse the situation.
True
In a drive thru lots oftimes immediate anything is not possible, but if I can I would too, Just don't know what happened yet.
If someone is " altercating " at my window and I take my eyes off them to accelerate, that may give them the opportunity to shoot me. It really has to be a good judgement call. Situation is everything, and what we do in a nano second will live or be dead for ever.