Ovinomancer
No flips for you!
The GM has no general authority to deny actions. The Attack action can only be used if it's specific prerequisites are not met. That's the specific rules for that action, not the GM using a general power to deny any action. And, I see no mention of orcs in those requirements, so I have no idea what you're on about, here.I guess by this logic this GM's ability to deny an action only applies to attacks against orcs? Yeah, sorry, this is not gonna fly. It is about setting limits and the situation is just an example.
Again, and please read carefully with the intent to try to understand, the Attack action having prerequisites does not imply that the GM can arbitrarily apply prerequsites to any other action. The GM can do this, via table rules or rulings, but that authority does not flow from the prerequisites on the Attack action -- it's established via the table rule.