Response to "Diagram by Chirstopher Merkner"

During the beginning of the flash fiction, I honestly thought this was going to be a story about dogs and a character based on curella de'vil. Or a story about a very mean old hag of a headmistress like the principal from Matilda. But as the story continues, I am distraught to find out it involves a father attempting to murder his children? Or was he trying to prevent so? As I try to reread the story, my opinion on it changes to curiosity to confusion.

Maybe the headmistress is just a temporary subconscious that is in the father's head during a time of grief with his dead son?

I am a little confused with this flash fiction and I'm not really a type that enjoys these open ended questions.