Bai Zhongtian has been acquainted with Great Master Wu Yin for so many years and he knows Great Master Wu Yin's character very well! Since her Master had not said anything, that proves that the old man could be trusted.
"This spiritual weapon is not a gift to you. Instead, I'm hoping that you can protect my Master and Ye Nuo with it. You are the most powerful one here which is why I'm giving you this spiritual weapon." Gu Ruoyun instructed solemnly as she turned to face Great Master Wu Yin.
Wu Yin took a deep breath and put the spiritual weapon away. He then smiled and said, "Gu girl, don't worry. As long as I'm alive, I won't let these two die. You can rest assured and complete your task. There's no need to worry about us here."
"Alright, since that's the case, it's time for me to leave. Master, I'll come to find you when I'm done."