As a soldier, Luo Zheng would never allow himself to fail. This is a principle, a bottom line defended with his life. His firmness is to give Charlie no chance and to extinguish Eck's hope, thereby extracting useful confessions. Even having Shi Feng fetch a late-night snack was a psychological hint for Eck.
Eck's body was beginning to weaken, and his mind was getting a bit confused, yet he was still gritting his teeth to hold on. As an excellent Special Agent, Eck was not afraid of death, but this process of watching himself bleed to death with open eyes was incredibly painful and despairing.
"Well done, I didn't expect your tactic of pushing the interrogation to the brink of death would work, even forcing Charlie into a panic. Very good, keep pressuring Eck, he will confess in no more than three minutes." A voice rang out in the earpiece, it was Hong Meihua.