they accidentally free lucifer

Came in the Inbox:

I know that it was just Lucifer that Sam wanted to talk to but once Sam is actually in the cage Adam and Michael should be there as well. Any ideas on where they are?

The Cage we saw in the episode wasn’t the real Cage.  At the beginning of the episode, the Winchesters had a whole conversation with Crowley about how to execute their plan with the least amount of danger to Sam and lowest risk of accidentally setting Lucifer free (’cause history tells us that’s totally something that would happen).

(Whoops, did I say that out loud?  Anyways…)

The idea was finding a way to create a “neutral ground” for the meeting so they could control the interaction.  Remember, when they first arrived at the Cage we saw, it was empty.  Rowena’s job, besides the warding, was calling Lucifer forth from the actual Cage.  That’s why Michael/Adam weren’t there.  They were still in the real Cage.

Basically, don’t think of what we saw as the actual Cage so much as a representation of it (hence the need for all the warding and Rowena’s interpretation of the Book of the Damned).