He raises his eyebrows, a bit bemused. "Well, thank you, I think. Adrienne tends to smack me about whenever I start acting too much like him or my uncle."

Theo doesn't generally murder living people. But when undead disrespect him well... a necromancer demi-god has to do what a necomancer demi-god has to do. If the guy had just handed over the gems, he'd be fine.