Your male isn't really fully male. Pale stripes, black edges on the tail, and I can't quite tell, but it looks like it is missing it's namesake: the black spot on its breast. Just a guess, but the relative closeness in size, and color pattern may be why he's chasing her...to establish better dominance?
Honestly? Mine don't go that far as to swallow the air lol. Urs are hardcore.My female poops air bubbles all the time.
I did a search but the one that came up where the other swallowtails. :/genicanthus angels are terribly tricky.
the males are very difficult to remain males for some reason.
i believe copps and other reefers have discussed this before somewhere here.