Lao Si felt he couldn't just sit around and wait for death, so he made the first request, hoping it would be agreed to.
Lao Er was also quite shocked. He hadn't expected that someone would actually say such a thing at a time like this. It seemed he was still of some use. Otherwise, why would they even think of him? With that thought, he relaxed a bit. Fine, even if he was about to leave, he decided to milk them for their last bit of usefulness.
Only then did he feel it would be somewhat fair. With this in mind, he calmed down further and didn't pursue why they hadn't kept him safe earlier. After all, they were just paying back an old score. Thinking this way, his heart was incredibly at peace.