Mrs. Deng only gave a small detail that she didn't think was important. But for Axel, it was a huge detail. After spending weeks with Moose and sometimes Gray would tag along, Axel somehow got influenced by their way of thinking. Not their twisted train of thought, though. Gray and Moose might look easy to deal with. However, those guys were good at picking up even the smallest details to gain logical thinking.
That was why when Mrs. Deng mentioned the Lyon Group's anniversary, Axel immediately called his brother. Axel might not know the actual plan, but at least they got an idea that Silas might make his move on the night of the company anniversary event.
Nothing changed, though.