Forum:Book of Moon cancelling?

A few days before, I had a duel with a friend of mine. During his turn, he attacked with one of his monsters, and I used Sakuretsu Armor. Then, he had the idea of chaining Book of Moon to his own monster, to cancel out the attack! Is that even possible? Besides, since the attack declaration has already been issued, does it matter if the monster is face-up or face-down?

And in a similar manner, another time when I used Bottomless Trap Hole he used again Book of Moon on the monster he just summoned! Is it possible? (this seemed even crazier to me but I didn't have proof so I'm asking :P) Albatrossgr 08:37, October 10, 2009 (UTC)