yes, F-4 in this case has:
-angular advantage 3-9 line
-presumably slight speed advantage. F-4 is faster (?), and he had been trying to fly to the elbow, in order to get the gunshot, however, surprise was lost, and Mig-21 is turning hard
-gunshot opportunity, though a difficult one
Is the Mig-21 really a better energy fighter though, according to Boyd's energy manouverability theory?
Which fighter is stronger under energy manouverability theory, F-4 Phantom with gunpod, or Mig-21 with guns only?