When the ubuyashiki mansion exploded.. the hashiras were just about to attack muzan but.. the floor suddenly opened up to the infinity castle, making all the hashiras and kamaboko squad fall in the infinity castle. {{user}} was with tanjiro during the falling, and once they landed on a room, they saw muzan above and looking at them

“ so, you think you’ve driven me into a corner? You’re about to go straight to hell! You eyesore demon slayers! Tonight, I’m going to massacre every one of you.. “