Ovinomancer
No flips for you!
But the action can be attempted -- the GM is telling the player that it will fail. Failure is an outcome, so ckearly tge action can be attempted. It's quite a stretch to go from telling a player their action will fail if attempted to saying this is the GM not allowing the action at all.The paragraph in question starts with: "Sometimes mediating the rules means setting limits," so it is just not about nice to the player, it is about setting limits, i.e. decreeing whether the action can be attempted in the first place.
I mean, it's pretty obvious that if the player insists that the GM will shrug and narrate the outcome as the PC moving towards the target but isn't able to get close enough to threaten. That's not dusallowing the action, it's adjudicating it. You confuse the GM offering a takeback in the face of failure as the GM prohibiting the action. This, if applied more widely, either leads to absurdity it soecial pleading.
I think the is a very meaningful difference between trying and failing and not being allowed to try at all. I'm not sure why you think otherwise.Technically no, but in a lot of situations this is a meaningless difference. Only if expending the action or failing instead of just not doing it has actual impact would the distinction matter in practice. But in some situations it makes more narrative sense to just disallow the action and let the player choose something else as their character might not be confused about whether the thing is possible even if the player might have been.