"Perhaps this child fits some of the other psychological factors found in many of the previous antagonists (single parent, no parent, depression, etc.)."

Like, having been abused and bullied until he couldn't take it anymore? We don't even know any of that this is all just speculation.

If there WERE zombies in the story it's much more likely to have been fiction, although zombies could be metaphorially appropriate for the school's citizens.

So you never wrote anything assignment-related in your journal?

Personally I think that storyline would be a great novel or computer game. Zombies take over your school and you have to kill all the infected and rescue anyone who is ok. That would be awesome if done well.