From that reaction...he supposes it's not a process that can be undone.

"If the Medals are what is causing it...you can leave them aside for now."

It isn't really a solution, he knows. From the way Eiji has talked about his fight back home, Chase knows how concerned he is about them. But if it turns out not to be true that they return to the moment they left...then Eiji would be all the worse off if he lost more of his senses.

"...You have gone to the hospitals here?" With all the races that they see, maybe they could have done something.