On the duty roster there's one corridor left unmanned, only during the twelfth dance. I asked about it and got no answer, which only made me more curious.

• Rodion VershininI stand that corridor.
  Anatoly ZverinIt's not written on the roster.
  Rodion VershininThere was no need to write it, so I didn't.
• Marfa YuryevnaWhy are you looking at someone else's roster. Wash your hands and get out.