Jerrica, Lacena, and Jessa spent the entire year training so hard that they could barely feel their bodies. Jin had put them through a training regimen that they had never experienced before, and it worked them to the core.
During this time, Jin meditated to recover from his injuries, feeling the weight of the world crashing into his body. Since he wasn't in his old body, he wasn't able to negate the effects of what he had experienced, divine tribulation.
Only gods are able to interfere with the natural order of things. Of course, Jin managed to bypass a lot of those natural orders, such as creating a fixed point, but even then, he could still get punished later.
One of the main reasons why Jin was in this room in the first place was to avoid the divine tribulation by getting stronger. He planned on becoming whole again, getting his powers back, then comprehending the Laws of the Universe so he could actually fight against Eve and whatever she had planned.
