Mira question fell to Derek when they were away from the temple so he looked at her and said "Luci, does not mind us being alone because she trusts me and one of the strongest pillar of a relationship is trust. Besides, if Wolfbane is truly at your kingdom. Then he will use Luci against me. No one can resits the dark whispers, he has promises of things that he cannot do. Once someone has served their purpose, he kills them to cover up his tracks". Derek went silent as he thought about it before he said "Wolfbane once control my mind, promises of impossible things but I believed him. When I discovered what he really intended to do with me, I found courage thanks to Luci to turn my back on him and help the furious five defeat him"