The walk to the Air God's residence did not take long, as all the alpha gods lived quite close to one another like the dysfunctional family that they are. Though Sky was mentally griping inside his head, wanting to kick himself, every step of the way there.
Days in the Realm of Gods were extremely long. But it has only been a day since Aero retired to his residence with the injuries he sustained, while stealing the spellbook out from underneath Axel and Moon. Sky could not be certain that it was enough time for the Air God's injuries to heal yet.
Not to mention, there was the issue of having Moon's presence in the Mortal Realm in any way at all. Proxying could put her at risk. If the creature she proxied into died while her consciousness was in its body, that would mean the end of her as well. It was entirely too risky for a novice. Sky did not want Moon to become a proxy god at all.