Of course, after the lecture on what happens with a zombie bite and how the Huachucas handle it (it’s a long, slow, painful process), it adds to the pointlessness of Maw’s actions here. Suzie cared more about Zane’s suffereing than his mother does. Maw’s grief is selfish, all about her feelings, and none about how killing Zane prevented him suffering a long, painful, drawnout, horrible death.