Strain can take a toll on the body quite heavily. Since he hasn't had a good amount of rest upon his journey, the feeling of being overwhelmed finally takes a toll on him. Helping out people's problems, being thrown into life-threatening situations. All the stress has accumulated and he reverts to his listless self. Without his sister to be here to help him like she's always done, everyone else has to find a way to take care of the Traveler. "So... it seems that you've reached your breaking point and have finally returned to your listless form... big brother."