The energy field was constructed by four Titan Robots releasing energy simultaneously, effectively trapping the guy in a transparent glass jar from which he couldn't break free. Then, using a pulsed method, air was injected into the field cylinder. At first, the person inside showed no reaction, but as the pressure increased, his body began to compress, and breathing became difficult.
He desperately beat against the energy field inside the jar, but Gu Tao merely looked up at him, as the pressure continued to increase above.
When the pressure reached twenty atmospheres, the Chomhzi were the first to succumb. Individually, they were extremely fragile and burst inside the jar. The man was not much better off, his eyeballs had been squeezed out, cloudy vitreous bulging out, but thanks to his immortal body, he wouldn't die.