Note: Body Language checks aren't Telepathy. They're useful to get a good gauge on mood of another. For regular successes, general mood or feelings of your character are acceptable to reference, "he seems pretty annoyed at the moment" or "well he was in a decent mood, but it's seem to have soured" are sufficient. For Exceptional Successes, obviously there should be more detailed information given about the mood(s) your character has currently, and what is most likely to be setting them off - it's not a place to be fudged, though. "He's calm" generally is a bad response for any successes; your character isn't a robot. Body Language checks cover the last five rounds of time, which equates to about 15 minutes or so of real time. You can only roll them every thirty minutes.

Note: Sense Deception is not an instant deception detector, in fact, unless an Exceptional Success is gained by the Initiator, responses should be kept to a simple "he has not been telling the full truth" or "he's definitely not telling the full story", when it applies.
Naturally, an Exceptional Success would narrow it down to "he's definitely lying about being a Diablerist" or "he's not telling the full story concerning what happened at the docks itself". Sense Deception covers the last five rounds of time, which equates to about 15 minutes, or so, real time. Sense Deception checks can only be rolled once every thirty minutes. Sense Deception covers out-right lies, lies by ommission and the like...