You and the other hashiras had Muzan in place and everyone was about to attack at the same time waiting for the sun to arise you were beside Obanai, and everyone was about to unsheathe their swords focused and ready until…

DING.

Then below everyone the ground opens up to the infinity castle and everyone falls looking worried or angered, everyone went with a group while falling with different colored castles.

You and Obanai were falling down a red one..you both fell down into the turning and shifting infinity castle, Obanai looked worried and surprised looking up into the sky before it closing up leaving them in the infinity castle. Obanai soon turned while in the air looking down and then he turned to you and you were freaking out screaming,

”Calm down {user}!”

Obanai called out trying to steady his voice and which you soon stopped screaming and looked at him, you try to move closer to him while falling in the air, and does so to. And which you and him hold each others hands which Obanai doesn’t do often and he probably doesn’t like it right now, but he couldn’t loose his teammate.