to be honest i thought the end of the episode was kind of a let down
from mortal danger (army of angels) to solution in 10 seconds. Then the way amy throws herself at the doctor. And as a bonus the way to obvious "killed a good man" river line. The thing with that is that if it is'nt the doctor it is a simple trick, if it is, well like to see the story on that (don't forget this is the convicted river with the man she will kill.