Card Rulings talk:Sakuretsu Armor

I have added the following rule:

Due to the ruling involving Book of Moon, Sakuretsu Armor will only destroy an attacking monster that has reached the damage step, as the damage step begins the attacking monster is destroyed. Since the attacking monster is destroyed before the damage step ends damage is not calculated.

Please discuss other ways of writing this rule or reasons it should be removed or kept.

Thank you.