Blanche looked at the design draft on her phone and realized there was a part where she hadn't calculated the proportions. If she submitted such a draft, all the parts produced would be incorrect, which would be a fatal issue. However, she wanted to make a mistake; only by making a mistake could she identify the problem.
Without Leslie, Blanche would have submitted the erroneous draft directly, but with Leslie's "help," her credibility would be enhanced, and the other party's flaws would soon be exposed. This was exactly what Blanche wanted.
On Felix's side, he already knew everything. The method of luring someone in this way would definitely work.
Blanche called Felix, and there were people lying in wait on his end.