Elias continues to investigate what is sapping magic from Lucy and Simeon. Chise gets a lecture from Hazel on her lack of self-preservation, and the students volunteer to do some gathering at the waste tower as Hallowe'en arrives.
My guess is that it was 
one of the undergrounders.
.أعتقد أنّه واحد من القابعين تحت الأرض
Meine Vermutung ist, dass es
einer aus dem Untergrund war.
Ho idea che tutto questo 
sia opera di qualcuno dei sotterranei.
Eu acho que o pessoal do
subsolo que causou problemas.
Я подозреваю, что за всем стоит
кто-то из подземных работников.