He didn't say anything for a moment, tipping his head back to look up at the stars, expression thoughtful. There were plenty of reasons, of course -- some, he felt, she could probably guess at for herself -- but in the end, the one he kept circling back to in his own thoughts seemed the most pertinent. Maybe he didn't owe her an explanation, but he could give her one if she was so insistent.

"It's not because I can't swim."