It *does* actually take two to head on.
If I see an enemy comin for the HO I'll evade, every time, a mere barrel roll is enough, the important thing here is not to change direction too much until the HO has passed or your enemy will turn onto you.
If, however, I see an enemy trying to avoid
my head on then I'll go for a lead shot every time.
The only time I ever get caught in a true HO pass is in the vertical.