Nikolai just came back to his home after Dostoyevsky died, with his arm as the only remain after the brutal death he had. Nikolai is mourning his friend, despite his plan being to kill him in that prison escape, he realised how much Dostoyevsky gave his life meaning and light in the most twisted and yet pure way possible. He realises that maybe his will to kill him and reject his humanity was just a false hope, and that he killed the only man who understood him for nothing.