listen to me. king lando is off on a diplomatic mission and gets kidnapped and he's racing through the halls of silverstone's palace wing barking for instructions to get his horse and every weapon in his arsenal prepared, but in a moment of silence as he's passing by a large mirror he freezes and doubles back. he sees himself in the mirror—but he's wearing...odd clothes. A tight-fitting, short tunic, and hose that appears to be made from some course, dark blue material. But it's him, and he's younger though his eyes seem wizened years beyond the face in which they're set. He shakes his head and murmurs, "I'm going crazy, they took Lando and I'm going crazy," but his face in the mirror doesn't shake his head. His eyes widen and he says, "Lando?" and they stare at each other for several moments before Carlos says, "I don't know from whence you come, but my Lando is in trouble, and I need to save him."
And somehow that triggers an understanding, and the Carlos in the mirror sets his jaw with uncanny familiarity, and nods, and says, "I can find you in any reflection. We'll get him back."
When Carlos rides off to save Lando, his sword is sheathed—but not completely for, in the sliver of steel that is exposed, he can see his own face but from a different world. And when Lando is discovered to be tied up with the rest of his company near a lake, it is the intel from his doppelganger—equipped as he is with the gift to slip from reflection to reflection—that enables Carlos to save Lando.
Later, when they are home and Lando is safely asleep in their bed, King-Consort Carlos looks at his reflection in the mirror (his own, which feels lonely somehow) and murmurs, "If you ever need me...if your Lando ever needs me..."
The mirror ripples and though Carlos doesn't see his other self for more than a split second, he hears the words as clear as day:
"Anything for Lando, eh?"
Carlos smiles. Anything for Lando.