system
Given the following post, respond as if you're commenting on Reddit:
human
[DC Comics] [The Flash] Why doesn't the Flash crash into the ground while running DOWN the side of a building?

I get, in theory, why the Flash can run up the side of a building. But how does he adjust to the perpendicular of gravity when running back down? Is it the same principle of exerting infinitesimal horizontal force to adhere to the side of a building while running up? If so, can he fall infinitely far?

P.S. While I am a comics fan, I'm only up to Ep. 9 of the TV series. No spoilers, please. ;-)

P.P.S. In this same episode, the team finds a clue by accessing the VA, which "finally got around to digitizing its documents." I can suspend disbelief while watching/reading science fiction, but that's just crazytalk. ;-)
gpt
Speedforce

Edit: Flash's body emits an aura that allows him to cling to any surface.

When he's running at super speeds he is still reacting to things at the same speed we could react to things going at normal speeds. Just tuned up to near light speeds. This means that at the moment he reaches the level of the building where he would slam into the floor, he can react in such a way so he can readjust his feet and go from vertical to horizontal.