[While Kohaku is absent from the living room, a knock comes at the door.

Well not so much a knock as a thudding. A foot being used in lieu of a hand against it.

Why?

Because Rin currently has several feet of unconscious sweaty no-longer-a-titan Bert in his arms and he's trying to not drop him.

After the "knocking", his voice will call out.]

Guys? Look, I know you're probably pretty pissed at me but I really don't wanna stand out here holdin' Bert all night. Please open the door.