[He's not commandeering the ship, exactly; he has every intention of letting Sherlock sail away once he's done. Certainly, he has his little brother's ship surrounded by the Navy fleet, but that's only to ensure he won't try and sail away before Mycroft has the opportunity to check up on him.
Still. He anticipates a rather less than warm reception as he steps on board.]
1
Still. He anticipates a rather less than warm reception as he steps on board.]