Quote: When I walk him out the door, he should fall, but continues walking as if on some invisible plane with no gravity:
That's no problem, because any finished/released level shouldn't have a such 'nowhere'.
It is like this, because underneath is only a block of the skybox or any other block with the passable flag set. This means that the trace which searchs for the ground gets the value zero from the ground, because there is no solid ground. But, zero is the same value as being on ground, ergo: no falling!
