Mirrorrorrim
Hero
I don't buy that. Otherwise, I can just say "I squint at, and focus on the wizard, to make it look like I am casting a spell in a subtle fashion." Heck, I can make it look like I am starting to perform somatic components. What, are they going to try to Counterspell me?That said. Normally, a caster immediately knows if an other caster is spellcasting, simply by looking. Even an innate spell is normally obvious because of the focus of attention. Similarly, anyone who grows up in an imaginary world would recognize the intent of spellcasting.
What it comes down to is there is a heated debate about a rule that is not complete or clear, and both sides are claiming that their interpretation is the obvious one. It isn't obvious, or they'd agree. The circular argument is annoying because the thread keeps getting updated, drawing me in to seek new takes, and I see the same flawed, circular arguments from both sides. And again. And again.
I know one thing is true. How Perception of the battlefield is determined, and of the actions attempted on the battlefield, could benefit from clearer language.