"A Secret Technique?" 

What made the Dryad a bit 'afraid' of this boy was the fact that the boy controlled his energy intake very carefully, which was why his every move was not a waste and it could always bore fruit for the boy himself. 

Not to mention that judging from the energy consumption of the little boy, he should have exhausted his energy because his age was there and his energy core must not be too big around that age. 

But even so, the little boy didn't look as if he exhausted his energy, which means he really controlled his energy intake carefully and calculated everything well. 

He could use the minimum amount of energy to launch various lethal counter attacks one after another. 

This point became the instructor's and the special instructors' discussion topic once more. 

[The little boy should have a secret technique to use his special energy as effectively as possible or his control over his energy is already so good.]