[That is the very opposite of the impression John had got from his interactions with the man thus far.]

S'pose I'm a body between you and Moriarty.

[That... makes more sense in the doctor's mind.]

All right, then. We still need a way for me to 'die' to get off the radar. D'you think... we could get into some sort of shoot out with the police and I could be killed in the scuffle. If you think that's something Lestrade would help us with.