"Why?" Maya asks. "Are you doing this?"
Questions frantically scream around Harry's mind. He asks
"Who are you?" His mind continues "aliens? spacemen? invaders?"
Dimensionals. We study. We traverse dimensions. We study.
"Are you going to kill us?" Tisha's words were slurred, as if drugged. In truth, she had to force herself to ask it. She didn't care either way, but there was Harry...
There is no necessity for that. Your deaths have been studied.
Generally, they took that to mean human deaths had been studied. Only Harry understood the words referred to their own specific, individual deaths.