Putting aside the fact that Estefany became the strongest first-year student in seconds, Professor Catalina was also in shock, though a hint of dissatisfaction could be seen on her face. I suppose she's angry—after all, an unknown person from just a few minutes ago stole a high-blooded animal from her. But with the contract made, there's nothing she can do; the tiger is now bound to Estefany's soul. The only way to snatch a contracted animal is to kill the contractor, but in Estefany's case, this option isn't viable. If she dies, her contracted animals will die too, an unjust fate for those animals. That's why I always say Estefany's ability is a double-edged sword.