In the last conversation Apo and Pyro ever had, Pyro called the coven his family.
Later, one of these 'family members' told Apo they had killed him.
And Apo had mocked Pyro's use of family, but it's different, isn't it, to have proof. To stand in Oakhurst and ask where's Pyro? when you could guess and have someone tell you he's dead at the hands of family and be the only one whose head dips down.
(It's different to be the one to grieve.)











