It seems that the "accepted" definition of a HO is changing in the arena. I took a two year break from AH after 13 yrs of playing (AW to CK to WB to AH). At that time, an HO was considered firing on the initial merge and requiring that at least one of the involved parties take evasive action to avoid a collision, provided no one was destroyed.
I recently returned to AH and had an encounter with a Hurri while flying my Zeke. On the initial merge the Hurri began firing. I held my fire and ducked underneath. We then proceeded with a turn fight. After several turns I got the angle to get a shot off at the Hurri's left front (required full rudder deflection to do it) and got the kill. I got the front quarter shot due to using a "nose to nose turn" (basic ACM) and the Zero's better turn rate (the Hurri did not have the angle for a return shot when I fired). Next thing I know there is a whine from the opponent claiming I HO'd him. I explained to him he was not "HO'd", but simply out turned by a Zero.
Bottom line is that it takes two to HO and can be easily sidestepped either party. After the first turn in an engagement it is now an angles shot and not an "HO" (that includes B&Z fighting).
TShark
"If you're alone and meet a lone Zero, run like hell you're outnumbered!" - Joe Foss, USMC