Qian Cangyi had never considered before what level of impact it would take to knock himself unconscious.
No normal person would think about such a thing.
Moreover, research into this area wouldn't hold much significance.
Then, what should he do?
Considering that the Soul Link state is Wen Chengzhi's alchemy, and that Wen Chengzhi is able to hide his soul fragments within it, it implied that there might be other mechanisms hidden within the Soul Link. Perhaps, given a tiny bit of time, Wen Chengzhi could successfully fend off the three people and then return.
Of course, it's also possible that he won't do anything and wait for the three people to enter the Spacetime Inversion, under the help of a master alchemist, allowing him to merge with his original body.
Faced with these two possibilities, Qian Cangyi didn't dare to gamble.
He didn't have the capital to gamble either - everyone only has one life.