[HartleyMBaldwin]

The actor would have been between the victim's vehicle and the pickup window and possibly between the victim and employee.

Then the victim would have been in his own vehicle, not between the loony and the McDonald's employee, and thus not "right in the middle of the argument". Until he intervened.

[Deaf Smith]

I am really suspecting that you have never gone to a drive up fast food business…but you heard of such.