These mammals and their politics!
Oorr remains silent, and farewell the Marshal once he has finished. There is no time to check which feather is the cleanest. They need to act...
But it is also time for Oorr to learn the fate of its people. If there is a thing that can withstand the strongest winds of the elemental plane of air, that would be the bond between the birdfolk. This thought also leads to a painful realisation. Zippy can't follow him up there, on the Star Mounts. Only flying creatures can. Besides, he is depriving Zippy of its life. He is not a slave; he needs freedom.
After faring the well to Brox, Grimnir and Belwar (he is sure he will see them all again, even Belwar), Oorr gets Zippy form the stable and explains that he needs to go back to the Underdark where he can live a free life. Together, they will go in the same cavern where they got out of the Underdark and instruct him always to find a way to the surface, if demons are around. The hug between the feathered aarakocra and the hairy steeder lasts not enough for them to say goodbye, but this is the way things are. Two creatures so different shared a deep friendship.
Maybe not...maybe this isn't goodbye.
After the heartbreaking departure from Zippy, Oorr will finally find his to the Star Mounts... back to home.