Glimmer tenses a little as Abby nudges her, then nods and scoots a little away from Abby's side. Biting her lip, she picks up a dry twig and carefully, deliberately snaps it with a faint, distinct, 'crack.' The sentry tenses and steps away from his patrol, scanning the darkness as he closes in on Glimmer's position.

Which gives Abby the chance she needs, of course.