For some reason, I find this Teddy Bear business more chilling and ominous than even the steady occurrence of deadly and atrocious attacks. Perhaps it is in the element of betrayal by the "office assistant".
Apparently the office assistant, Sara Khawad used the teacher to get revenge against the administration of the school after an argument with the principal. One can only wonder why Khawad was so vindictive; she has a lot to answer for.