No one can inherently adapt to a new world.
Even great wizards or legendary wizards do not have this ability or talent.
If a wizard arrives at a new world and unexpectedly finds that he can, without Flerek's preparation, freely exchange energy and use magic in the new world, there is only one possibility—he has been to this world before.
And this "before" should belong to a very short time span. If he was born in this world and then taken elsewhere to grow, when he returns to this world, he would still need some time to adapt.
With this premise.
Taking into account the shared experiences and recent encounters of the young wizards in the Absolution Hunting Team, including Zheng Qing, everyone almost immediately realizes where this new world designated by the school as the trial arena is.
"Is this the Black Prison?"