It is said that Fuxi was calculated by Tathagata, who used a secret technique to extend the life of Nurhaci. The Great Qi Runner that Chi Songzi killed was not Huang Taiji, but Nurhaci, who should have died long ago.
Huang Taiji had already begun negotiating with Wu Sangui near Shanhai Pass. Wu Sangui wanted to lure him into the Pass to eliminate Li Zicheng, while Huang Taiji sought to seize the opportunity to enter the Pass and take over the world. Both harbored their own ulterior motives. The people of the Central Plains mostly looked down upon those from the Uttara Kuru Kingdom who came from the steppes, and Wu Sangui was no exception. In his view, although Huang Taiji was formidable, he was ultimately just a brute! Once he and Li Zicheng fought to mutual destruction within the Pass, Wu Sangui would then be able to crush Huang Taiji in one fell swoop.