@Ryll -
My idea has less assumptions because I didn't make up a third choice. When given a multiple choice question with only A and B as answers, I think answering C is considered the more out-of the-box one. Even you agree since you said it surprised Ginti in your imagined scenario.
I'm not entirely sure, but has the mask ever flipped after the people were inside the closed elevator? I think it has always stayed how it was. In previous episodes, they only delayed the display of the mask within the camera frame for suspense, but this is the first time it changed post entry. They even zoomed in on the mask switch. If it has no meaning, why waste frames on that? False analogy on the cat, btw.
Who wouldn't be shocked when they see their body disintegrating? Someone who knows they were about to lose it because they chose to do so.
Let's agree to disagree about Ginti's tone.
That leaves two things:
Why did Mayu ask where they were going if she asked to be sent to the void with Harada?
Why did she think that Harada would wake up despite knowing what kind of place the void was?
@Xel - Episode 11 showed two elevators in Ginti's bar. The other one had the devil mask on it. That's why I think the mask switch has meaning. If Mayu intended to go into the void, why didn't they just use the devil elevator 4 paces to the left?
On a different topic, did Ginti also lie when he said that the two were going to where Harada's soul was? Wasn't his soul inside his lifeless body? When the pair fell into the void, his soul popped out from that body, after all. Or did his banished soul go back inside the puppet for a moment when they were in the void, causing Harada to open his eyes for a moment, only to pop back out again after they became complete puppets? After writing it down, the latter sounds like it makes more sense.