Controlling skills,Breaking Roofs

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"He must have learned how to control his strength by now," remarked Luo Qingling as the two of them came to a stop in front of a large, thick and highly protective door. "I asked the specialists to bring Jia Xu to the training centre. If everything went alright then he should have had no problem in controlling his strength now." 

Boom!

There was a loud explosion inside the room which Luo Qingling showed full confidence in.

Hearing the bangs and booms, Luo Huian turned her head to Luo Qingling. She asked, "Are you quite sure about this?" 

"I am," answered Luo Qingling, though she was also frowning now. "This room is built especially for the S rank hunters to awaken successfully and get used to their strength and new skills. There is no way it would break."