Well, at least she knew that it was his hand. Or she could assume. Who really knew in the dark. Speaking of which...

"But what if up became down? Or right is really left?!" The peril of swimming in the dark. "What if I wasn't here with you while you swam in the dark?! You could be lost...foreeeeeveeeerrrrrrr..."

Just thinking about such a prospect worried her, and so she squeezed his hand.