If a character is airwalking and wants to gain / lose altitude, can they jump and "land" on the air? Or jump out of the air to the ground, as a counter?
It seems to me that if it is possible to jump on the air, then you should be able to climb higher with a series of "bunny hops" upward. On one hand, jumping is separate from airwalking, so is not limited to the 45 degree angle, but that somewhat subverts the first paragraph of the spell. Ergo, can you jump on air?