OOC: 40Z? If Bow could run circles around Brasso, why couldn't he stay about 60ft away to breathe a line of acid? Which, of course, is further than Brasso could use his secondary sound ability (30ft range). But, assuming it worked out in the dragonne's favor:
In any case, if Bow does not need to turn, then he will bite the creature and fly downwards at an angle, preparing to land soon, moving at half-speed. He will of course provoke an AoO. If he must turn, then he cannot afford to do anything else and will merely take a full round to move one speed increment and land at say 20N20E. Note that if Bow spends even 1ft to turn, then he will not have maintained his minimum forward speed (as a single move action) and will fall.