Flight is just membrane-assisted jumping. It is exactly the sort of process which evolution is really good at refining. I don't find it all surprising that it has evolved in bats as well as in birds and insects. Most of the other marvels of evolution are also processes which can gradually be refined. There is a continuum from fins to the legs of cheetahs and from simple excitable cells to the vast neural nets of our brains.
Vision is just a refinement of chemical photo- sensitivity.
When evolution appears to jump we may have to go to the improbable but possible. For example, according to the neo-natal hypothesis, we have many of the properties of apes with an inability to grow up. That apes with this fundamental developmental fault should be able to survive and breed is unlikely. However if they could, it would give them the tremendous advantage of lifelong mental flexibility. At the molecular level, there have been many jumps in types of chemical processes.