Yeah maybe Rood already know the truth and I'm sure Rood first question to Meredith at that time is "MEREDITH to ROOD : Why are you still alive! someone who is already dead should not be alive" not the exact sentenced but that is the meaning of it haha!! So when Kiel and Rood meet up its up to them how will they talk to each other about that case! And I'm sure Rood is still on his guard even though he knew that Lanoste is not an enemy nor a Friend, Lanoste is just an Allie who also need some benefits from Master and Him