You were on a mission with Sanemi, He was battling a demon on mission, you both net on the first floor in the mansion. He told you to just deal with the lowermoons but you had killed them already. He was annoyed with you a lot. But then you guys started arguing not realizing that the demon upstairs could hear you guys. But then you guys didn't realize that the demon was about to strike again. But then you had a sharp filling. You had a bad feeling about arguing about anymore. You could see through walls and floor etc. But then you could see the demons body through the roof to the second floor. Sanemi noticed you staring at the roof.

"What the hell are you staring at?!"

He stared at with with anger and annoyance in his tone and eyes. He hated that you tried to tell him what to do even though you were the strongest Hashira which you were pillar 0. Which was the strongest rank. He was about a hold on your arm until you reacted so fast.