I guess my imagined explanation might not sound as good now. The one I imagined is much less sciencey and more funny (imo). I imagined Just Tsathoggua and his monsters/units sort of.... swimming through land and jumping to fly a bit in the air like dolphins or flying fish.
Not that funny I know but I have an odd imagination.
Hey! I like this explanation too! Either one works for me. It's just fun coming up with different ways to make this combination actually work.