It wasn't just Shi Jia who was left speechless, even Alfred, Dan, and Akila were left stunned as well. These people were aware of Zero's actual strength, or at least they have an idea of what level he should be in but this far surpassed their wildest imaginations. At a point, Dan and Akila were convinced that Zero has been hiding his true strength from them, making it seem as if they were are equal in terms of combat strength.
When Zero fought Shi Jia back at the school, they assumed he was only able to showcase such power because he was desperate to preserve their name. They assumed he showcased such due to adrenaline and it was just a fluke but seeing him calmly releasing the power of that level once again and casually at that, these people were forced to believe, the last match between Zero and Shi Jia was not a fluke!
"Defensive Combat technique: Turtle shell!" Zero growled as he was forced to retreat a bit by the blood-red flames.
Xiu!
Xiu!