After calming down considerably, Acht turned around to Lein who was looking at him with a surprised look, and said.
"Let's go. I have things I want to ask you."
She didn't respond immediately since she was still flabbergasted by Acht's ability to pull off such a dangerous task and still get out pretty much unscathed.
But, she then shook her head and erased such thoughts before she started swimming toward him.
He was also about to turn around and leave but stopped when she did something unexpected.
She had closed up on him and tapped on his back once and muttered.
"Thanks for saving my life."
Her words were quick and almost inaudible but he was able to hear them clearly. However, he chose not to say anything and merely start swimming.
The truth is, he didn't save her because he wanted to but because she said something that might affect him greatly so her gratitude, as much as he doesn't care about it, is not something he could accept nor even pretend to accept.