Some rambling thoughts:
(1) Defining HO's reminds me very much of the definition of ACM. In the USAF ACM has a strict definition and that is used for maneuvers in a 2v1 where aircraft are working in concert. Yet people here use ACM to mean 1v1 maneuvering. So in the same way folks will call Forward Quarter shots HO's.
(2) A face shot is a face shot no matter if you're 0 lead angle off the nose going "beak to beak" or if the shooter has 60 degree lead angle off of the bandit's nose. The target is being shot in the forward quarter.
(3) There's no shame in taking a HO or forward quarter shot. A shot is a shot. The object is to shoot the other guy down. Take what you can get.
(4) Getting a forward quarter shot or HO is independent of your skill in air combat. You might have used all the tactics and maneuvers in the world to get that shot. You might not have.
(5) If I happen to be the one being hit in the front quarter, my plane is the flight path of my advesary's bullets. Whether I like it or not I've maneuverd my plane into a position to get hit in the front quarter either unintentionally or by choice. If I don't like that then I should figure out ways I can stay out of them next time

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Tango, XO
412th FS Braunco Mustangs