Shannon's breath had gone shallow and ragged as she looked back at the Doctor with the same raw fear she'd looked at Jack with when she'd been having her first asthma attack on the Island. She opened her mouth to speak and a hiccup of a squeak came out instead, but she nodded.
Feeling paralyzed with fear wasn't something Shannon recognized. Even back on the Island, she hadn't felt as much fear as she felt now, if only because back then she'd felt a certain sort of denial that anything could happen to them before the rescue boat came. Here, she had no bubble of security whatsoever and it was worse, still, because at least the Island hadn't been an enclosed space.
"They're coming," she whispered. "Like they came for Claire and Charlie... The Others, it's them, I know it's them. The Smoke Monster..." she babbled disjointedly, pausing to hiccup over a sob she didn't want to release. Her eyes went back to the Doctor's face just before he looked over his shoulder. You can't stop it; nobody can, she thought miserably.