Does Royal Command negate Slate Warrior's second effect?
Since it doesn't require Slate Warrior to be flipped, that would make the second effect not a Flip Effect. So, would Royal Command still negate it?
Royal Command "negates the activation and effect of all Flip Effect monsters' effects." It doesn't say "negate the Flip Effects of Flip Effect monsters," which may make it able to negate the second effect of Slate Warrior.
Since it doesn't require Slate Warrior to be flipped, that would make the second effect not a Flip Effect. So, would Royal Command still negate it?
Royal Command "negates the activation and effect of all Flip Effect monsters' effects." It doesn't say "negate the Flip Effects of Flip Effect monsters," which may make it able to negate the second effect of Slate Warrior.