Erika kills vampires, but not in the usual manner. Her way leaves a body behind, the demon cleansed from the vessel it tried to control. Mitch is a Hunter and Erika's trainer. However, Mitch is ever the traditionalist and focuses more on the physical training and not Erika's unique ability. Adonis has no qualms about training Erika to use her ability. As long as she uses it to achieve his goals.