And GC said "you can't prove it", instead of, for instance, "can you prove it?" One is a request or perhaps a challenge for evidence; the other is a blanket rejection of the claim, forestalling further discussion.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'
