Chaos Pinkbean And Resistance Revamp Coming?

Just realized the door to the left is open. Is that the "Dimensional Schism" or is this a possible hint at "Door to the Present"?

It's the big door in the Black Magician's main corridor.
Maybe the middle door in the Three Doors map of Time Temple will open and lead to the past.

If you watch the Mercedes animated intro, you'll see her with Freed. That is why you see Mercedes and Freed close to each other.
Demon Slayer is also there because in his animated intro he tried to defeat the Black Magician on his own, but failed.