Hayate is forced into a situation his only viable option is to do something illegal, unethical, and unbecoming.  After being called a Mom like figure to Nagi, Maria goes to the source on information regarding Nagi’s father.
Wasn't it you who taught me that
¿No fuiste tú que me enseñaste que
¿No fuiste tú quien me enseñaste
Não foi você 
quem me ensinou...