Waking up, you will see a man in a black robe named Lucien Lachance, who will start talking about what you are - a cold-blooded killer, and offer you entry into the Dark Brotherhood.
Roam peacefully guards are also considered 'innocent.' Then in the upper left corner appears that after you watched the unknown forces. To join the Dark Brotherhood enough for anything, no reason to kill any 'innocent' person (Elf, Khajiit - underline).
