[spoilers] Lucas. Just Lucas.

[BoHenley]

I was also surprised Harry didn't work harder to save Lucas in that scene (on the roof). There were better things he could've said, he must've known the "real" Lucas was "in there," but to just say "Are you John the murderer, or Lucas the [trusted agent...sorry can't remember the real line]" just seems feeble. Okay I know L/J has a gun at him, but with Harry being the diplomat, it's a shame the writers didn't give him better lines in such a powerful moment. So yes, Harry was MI5 to the end, and Lucas was sacrificed/sacrificed himself.

I'm still mad they wrote out a popular character THAT WAY.