So, Malachi decides to kill Leon and Mephistopheles tells Thelma how to contact Ella so she can have her save Leon.
Why? Mephistopheles says he's grown fond of the boy. First off, how much has Mephistopheles actually seen of Leon? And second, considering he's aiming to corrupt all mankind why would he care about some troublesome kid?
Is there some way this makes sense?