The door had shut closed the moment her other leg left the Cathedral's "bright side". Counting her own steps, she had realized the short distance between the point of origin where the noises came from and the entrance had stretched a lot more. Despite the distance, a dim light revealed itself far away. It got closer and closer as she approached.
What seemed to be endless void had opened into a wide, empty room where two figures struggled in the middle. A wounded Vincent held tight onto a chest wound, bleeding onto the floor while his other iteration - still him, but also not - was holding pressure, not letting the cracks spread further from the original wound. It was the same death Revenant had seen from the figures battling against themselves over the plains.
Caliban's cracked helmet left her see the waves of emotions he felt, holding onto dear life to not die again. An exposed eye to see the dim light hanging above the three, focused on the wound and nothing else.
"Test the sharpness of your sword against another. And when that is not enough, unsheathe your cunning as the hidden dagger that ends the fight."