[Did he not notice she actually was pretty quick? Lydia's had to keep up with people just as tall as he is, and her Neitherworld adventures generally required lots of running or walking.]

Your pride does you no good if you're about to die.

[Somehow she still made it sound cheery, not judgemental. Just practical advice. She also really didn't blame him. It was at least partly her fault, since he'd realized he was being watched, that the zombie snuck up on him.]

You're not bad to hang out with yourself. Too bad I can't show you the place I'm used to exploring.

[Of course, most people wouldn't understand the Neitherworld the way she did. She'd have to make it clear that no--you do not fight the monsters there. Most of them are nice, and already dead anyways.]