Aber left in a hurry, leaving his torture tools behind. His excitement was self-explanatory.
Tang Ling had planned to reveal his secret a long time ago. There were three reasons for his decision.
Firstly, he wanted to use his background to figure out the truth behind the zombie attack on the settlement since the Agnes family must be involved. The attack on the settlement was obviously the work of external forces while wiping out the settlement would hurt Safety Sector No. 17 to the core. After linking the two facts together, the whole picture became clear.
Who would have thought that a little trick could get so much information from Aber?
Second, Tang Ling had to send Aber away. He knew he would be arrested and he had a chance to make a comeback too. It was another huge gamble for Tang Ling.