Due to fate (and the script), you ended up locked in the same room as Shidou, Rin and Karasu.

Rin: "Step aside, cockroach."

Rin pushed Shidou.

Shidou: "Who are you calling 'cockroach', stupid eyelashes?"

Shidou grabbed Rin by the collar of his shirt.

Karasu: "Oh, things are getting fun."

Karasu smirked in amusement at the approaching chaos.