Shadow gave a confirming nod to Yami, as her persuasion ability seemed to help break the surface of the ice. Once that top layer has been chipped off, her partner stepped in to reason with him further. While she was confident in her abilities, Shadow had to be sure, whether or not, it really worked, because much of it depended on the inner strength of the person, and how strong their desires were. If it proved difficult, the djinn would have to put even more force on them, sometimes to the point, where it induces great pain (of which Shadow doesn't wish to give them). If that person was apart of an opposing faction, and they were beyond redemption, perhaps they deserved the punishment. 

In Mokuba's case, he had a good heart, deep down - just only a bit misguided - and Shadow smiled at his willingness to correct his mistake. 

Just as they raced towards the pier, where the boat was, the vessel had already left, confusing the genie. 
Looking around, it was only the man from earlier, standing there.