Eliza was nervous because she would have to face her Master, the man she respects the most, he is more than a father; he is her friend, her confidant, her right hand, you could say he is very important to her, which makes Vincent being jealous of him.
Killian, is a man of unknown age, a mysterious man himself, with red eyes and silver hair. He is the only one in his generation who was born with silver hair, since the rest of his relatives have red hair, but the simple fact of being born with this hair makes him automatically elected to be the Patriarch of the Clan.
Since he was born, has become exposed to intense training to be the best of the best. Since it is a must that he has to be the head of the Clan, it's essential for him to be extremely strong, as not to lose any contest within the Clan, not to bring shame from outside.