Emei Sect was still unaware of the existence of the Nanming Leaving Fire Sword and the four treasures hidden by Ai Zhenzi. Otherwise, they would've just taken it to compete in a swordfight with the Wutai Sect. With the Nanming Leaving Fire Sword, Qi Shuming wouldn't have had to endure the hardships of refining the Golden Fierce Fire Sword in the East Sea. He could've just passed it on to his disciples when the time came for them to use it.
They always waited for the right opportunity to arise. Only then would they calculate the future of their disciples and discover that they would obtain these treasures in certain places. If they had known beforehand, they would've still needed a certain catalyst.
Shi Feiyang silently took the treasures and when he came out, Deng Bagu was already fighting with Wei Tu. She wasn't good with words to begin with, barely holding her own in a forced conversation with Wei Tu.