Spoilers everywhere:

Well, I don't really get why Michael did that. Let's suppose he really found the Others (remember the guy with the fake beard said they wouldn't be found, unless they wanted). Michael did what he did because of Walt, but I can't see Michael and the Others making a deal. Henry said the Others would never make a deal and I agree, first because Henry is worthless, second because Walt is special in some way, so he's too important to be exchanged, even for a couple of deaths (why would they want her dead anyway? As for the second one it seems it was an accident, coz Michael looked surprised, but he would have to kill her anyway coz she witnessed all of it).

Well, I'm lost