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He casually shoved the Spirit Tribulation protagonist into the core of the Sky Tower, without the need for any Sealing, as Qin Muye had already knocked some sense out of him.
It was akin to having the Heroic Spirits still around, but their collective consciousness had vanished, so it essentially reverted to its primitive state of Spirit Tribulation, albeit slightly better since the Heroic Spirits were still there.
There's no need to worry about anyone releasing this thing; Qin Muye was waiting right here.
The reason he dared not use Sealing or other means to take him prisoner was that he feared it would be judged as having survived the cataclysmic main mission.
The situation was simple: as the catastrophe had already begun, to stop it would naturally be considered as having overcome it.
As for not getting through... well, if everyone's gone, what's there to question?
So, Qin Muye could only deal with it temporarily.