Weiss jumped, landing on a sigil, shooting forward with incredible speed. Her blade was aimed to kill before Yang could get there. However, before she could do this, she screeched, tumbling to the ground, her skin cracking, black smoke leaking from it. The copy of Weiss seemed to go through a seizur, as black smoke came from it's eyes, ears and mouth, before it's skind completely exploded, revealing the black shade from before. The blackness seems to be leaking away, however, and soon all that's left is a brightly gleaming black gem. 
Bob chuckles. "Well done. Fear is easily defeated through a demonstration of bravery." He smiles at this most amusing game, the girl who had not broken when faced with her own friend. "You certainly do have the right to face me. However, I'm not letting you off that easily." Bob narrows his eyes, as he holds out two hands. In each hand is a pil, one blue, and one red. "Take the red pill, and I will set you up in another of your friends in combat. If you win, I will admit I have been bested, and I will allow you to keep Mia. But I can guarantee this fight will be far harder. Take the blue pill, however, and you can avoid all that hustle. Instead, you will owe me a single favor, and I shall take my leave. Of course, who knows when I might pull in that favor?" Bob chuckles. Regardless of what she chose, this would be most amusing. Even if he were to lose Mia, this was just too beautiful an opportunity to miss.