Targetting X, and /focus set to Triangle
Two buttons, with these macros:
/cast [target=focus] Heroic Throw
/castsequence taunt,[target=focus] Heroic Throw
editted: One button version, but I'm not 100% sure on it
The effect is a taunt, and then a 'blind throw' at the focus target without actually changing targets. Mages often use a variation of the second line for resheep macros, so they don't have to change targets, thus giving them fractionally more time to DPS. You can test this by finding a couple of mobs and watching the throw go off, while your targeting doesn't appear change.
I suggest letting the MT pull Auriaya (or even initial aggro), then letting the cats get to within 8 yards. This prevents a pounce, though you need to stack notable threat asap or the healers will get pounced.