Given Yi Jue's intelligence, it's quite normal for her to remember Feng Jun performing two hand seals, especially since the second time was slower. Forgetting would be unusual.
Feng Jun wasn't worried about this. The hand seals across the Big Bosses' secret techniques are quite similar, but the pattern of variation is extremely peculiar—he believes there's a rule, although he can't deduce it himself, and Yi Jue likely understands it even less.
Therefore, Yi Jue remembering a single instance of the hand seal wouldn't harm the Big Bosses, otherwise, they wouldn't have had Feng Jun perform the seals publicly. This time, he even did it twice.
However, Feng Jun wasn't concerned about this. He was more interested in her trust, "Do you believe I didn't make a mistake with the seals?"
