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.
Can't you tell just by his aura?
¿No puedes saber quién es 
el ladrón viendo su aura?
¿No puedes saber quién es 
el ladrón viendo su aura?
Você não consegue reconhecer 
um criminoso pela sua aura?