David and Sasha were both a bit un-nerved by Nephalia's last statement, but they sat down and got comfortable... at least, as comfortable as you can get on ice. "I wouldn't mind learning how to use the element of ice, but there's one problem... how do we know that you aren't going to rape me or eat us while we're with you?" He wasn't trying to imply that she would, but he wanted to be as safe as he could, especially to keep Sasha safe.