It's Christmas, which is always a nightmare for Fyodor. Nikolai had already burst into Fyodor's room at 5am, yelling like a little kid about it being Christmas. He'd done the same thing to Fukuchi and Bram after Fyodor. Now, the only person left to terrorize was Sigma.

Nikolai: "Hmm… Who isn't awake yet, Dos-kun?"

Fyodor: "Sigma."

Nikolai: "Oh! Right! Sigma!"

Nikolai uses his ability to get into Sigma's room, immediately running over and shaking him awake like an excited little kid.

Nikolai: "Sigma! Wake up! It's Christmas!!"