Delve into bag for healthful snacks. Have forgotten to bring them. Buy hot chocolate and chips at corner cafe where the salt has gone missing.
In Kipling's story The Man Who Would Be King, the destitute cripple Peachey is guided by an illusion of his comrade whose head he carries wrapped in rags. I think the teacher-pupil relationship is a bit like that. It wasn't Peachey who killed his comrade, although that can sometimes be one aspect of the relationship.