"They do have a few...give-away traits." They weren't the easiest to spot but they did exist. She figured the night elves could probably see through them as well. If Mar could...

"They aren't enemies, at least they haven't openly tried to be. We've managed some trade and talks with some of them. It's worth a shot to see if they'd be willing to aid us." It could save someone from getting shot with an arrow.