In reply to WrightKnight
The issue with Pyrrha though is that pyrrha saw the blades multiply and clearly changed number.
Also as a counter to your point it may be that she didnt drop the illusion because they were discredited but rather they werent needed anymore.
Amber for example she sees the issue and the illusion continues but the whole reason Amber was able to see it was because Em was getting ready to attack. And so its possible Emerald didnt continue the illusion not because amber was taken out of it but because she was attacking and cant do both at the same time.
We already know 2 minds is not easy for her and she is shown concentrating to do her semblance.
Also while there was a couple of places she might have used her Semblance in battle such as when she is jumping behind trees during the coco fight that could be more Emerald is a ninja like character and she broke line of sight and used it rather then her semblance.
So its hard to say for certain if she can easily use it in battle or not.
CoCo does support your idea but that could be countered as there is a limit to what Emerald can make people believe. Sort of a range of things Yatsu being called was TOO far outside that range so Em couldnt make it belivable.
But something that works against is the Ambulance scene. Where Neo and Cinder dressed up like Workers took Merc and Emerald flat out states she worked on both their minds. Which based on your idea she wouldnt need to do as she can only make them see things yet Cinder and Neo are in Ambulance clothes so there is nothing for her to make them see.
Instead it seems more like she made them Buy into the whole scam aka making them thinking something.
That also plays into Amber as well since little girl in the middle of a field no houses around in a world where grimm are a real threat? That shouldnt have been belivable yet amber clearly bought it.
As for Aura no that isnt what I meant. I meant the whole Aura needs to be activated that wasnt expressed properly to us the audience and so we crafted a Fan theory.
Because we have so little about what Em can and cant do I dont want the same thing happening which is why I am staying back.
So to be clear I am not saying you are wrong. What I am saying is I want more in show explanation of her powers and limits since we already have had a situation where we THOUGHT we understood and it turns out no we didnt.
Also as a general Note please excuse the mess that is From my phone Posts a new update has happened that makes it so my phone adds in ' with words like Cant which wouldnt be bad if it didnt close the keyboard and resize the screen when it does it which causes issues like Can' to show up and for me to lose trains of thoughts. Its because I am literally fighting Spell check and my phone being REALLY dumb.
So once again not saying you are wrong because honestly I more then think you might be right but I am seeing enough stuff to say it may not be as we think especially since we know so little about Em's powers and limits.