SiChen knew there was no going back. The effort had already been made to drag the soul out of the body and now that it was simply roaming before him held by him, SiChen couldn't let it go
Sunni was struggling to keep up with the spell which seem as though it was going to break off at any time. And this had given SiChen the choice to do something.
What he had already done by helping cast out the soul was detrimental to his health and this which he was thinking of doing was more dangerous.
But yet again, He had no choice at the moment . He had already gotten this far.
With his eyes closed, He used up another power from him and sent red smokes hovering around the soul which was making its attempt to escape.
The red smoke had gathered around the soul and had stiffened it up while leading it on with the little effort made by Sunni.