Quote:
"you can't step on air that is higher than you are unless it's within 1 foot of the ground with no liquid between".
Totally agree.
The reason I have to get official interjection on this is because my DM doesn't believe this spell keeps you elevated because Air Walk is a 4th level spell... however, it carries massive penalties, is 1 level below fly (as pointed out), and you can't ascend unless the ground does.
It's an uphill battle.