Thanatos turns toward Kiyoiri and recognizes her from the train even if they haven't had too much occasion to interact previously.

"I need to return to my world. Have anyone been able to do that once arriving here?" Even if he was very limited in what he could do, the presence of his real body and his soul in the same location brought back Death. The tethering issue is a problem, but Thanatos is thinking on a different scale.

"That was too short of a time." He's working on being both Thanatos and Death Incarnate, but the ability to help relieve many mortals of their suffering was right there!