RUBY: Sorry, killed by an ambulance?

DOCTOR: Life is cheap, patients are expensive. The Villengard algorithm.

RUBY: The what?

DOCTOR: Villengard battle products are fitted with AI. The algorithm maintains a fighting force at just above the acceptable number of casualties. Keeps you fighting, keeps you dying, keeps you buying. The medical services optimise the casualty rate for continued conflict. War is business, and business is booming.