[They just cleared the train and Ariadne could hear the roar of it in her ears, just behind her as she kept her eyes shut while it passed, not even quite aware he was talking to her or even that he'd saved her. Her hand almost immediately found its way to his elbow, anchoring her as she worked on breathing.

Between her gasping breaths:] I can't do... this.

[She'd said something similar after being stabbed by Mal, of seeing what Cobb's subconscious could do to her.]