When exactly do you chain to Question? Is it when they declare their target or when it is activating? Say for example if my opponent guessed I had a Luster Dragon #2 at the bottom of my Graveyard, I chain with Call of the Haunted to his selection and Special Summon it. Since the target no longer is in the Graveyard and Oxygeddon is now the bottom monster would that be Special Summoned since his guess is now incorrect?