I'm going with her

After the explosion calmed down and the targeted king rank demon 'evaporated', everyone gradually came to their senses and someone in Aaron's group murmured their confusion. 

"Senior sister is just a king rank mage, right? How can senior sister cast a monarch rank spell?"

"Isn't it obvious?" The young lady said, her eyes glued to Margaret's figure in the air, "Senior sister is a genius. No, genius word doesn't define her awesomeness. She is beyond genius and what is impossible for others, for her, is nothing but a minor problem."

Everyone smiled wryly and shook their heads, not wanting to say anything, but the man continued.

"How can it be so simple, junior sister Eve? We have countless geniuses in the flame valley. Senior brother Aaron is such an example since he can fight king rank mages when he is just a peak five-star mage, but even he can't cast spells that are two ranks higher than his corresponding realm. I don't think—"

Slap!