User blog comment:Miskos3/Chapter 56, Review/@comment-29813281-20140407183845/@comment-93.209.42.254-20140408080647

I understood the Ackerman guy in the way that he trained Levi, so he is responsible that the survey corps made it so far, too. His way of slicing peoples' throats reminds me on Levi's skilled Titan killing (just the other side).

We don't know really where Erwin is and how safe the place is. Historia is most likely safe, too, because Reiss wasn't pretty keen on killing his daughter. Eren can't be hurt so easily, or it's Titan time. I assume next chapter will be Levi against anti-human 3DMG Ackerman, and we'll learn about their relationship. Mikasa coudl play a role, too. However, Erwin is not needed anymore (?), actually. So Isayama could kill him.