As Li Shen fight against the tribulation with his life and the others on the line, he was blaming himself. It was fine if he was the only one who was suffering from his mistake, but the others were implicated because of him.
Li Shen now knew that because he was in a separate dimension, the Heavenly Tribulation for his breakthrough was delayed. After he exited with Fang Chen and Jun, he was dumbfounded when Heavenly Pressure fell from the sky and dark clouds began to form above him.
By the time the others came out right after could escape with Fang Chen and Jun, the Heavenly Tribulation was already formed.
However, Li Shen was blaming himself too much.
It wasn’t that he entirely forgot about the possibility of him undergoing a Heavenly Tribulation, but when he went back in time and talk to his ancestor Qin Bai, and even had that ancestor tell him someone said to kill his disciple Yang Su. How could he focus on going through a Heavenly Tribulation that was completely absent?