Lucy hurries to catch up, her heels really not helpful in walking around here. Couldn't the dream have given her some sensible footwear? Before she's properly caught up with him, she stumbles and twists her ankle a bit.

She swears and stops, leaning against a large rock, then looks towards Peter and calls "Peter, get back here!" with rather noticable annoyance. She slips her foot out of her shoe and lifts it, rubbing her ankle a bit to try to soften the pain.