C72 White Hunter?

"Count down to ten, you start attacking!" The examiner said calmly. There was a voice changer in his helmet, so he couldn't tell whether the person was male or female.

Gao Zhan nodded. He took out the long knife Yang Sha gave him from his back and started to adjust his breathing.

Breathing was very important in a battle. The rhythm of breathing basically represented the rhythm of the battle