Peggy's been scanning the area to keep an eye out for anything that might pose as a danger, because she doesn't want Karen to get in any kind of situation that she might be able to stop. From the bottom, she can only rely on her own skill to belay Karen and hold onto her as tightly as she can, careful not to let go (and keeping an eye on the strength and structure of the rope, having nightmares sometimes about her own snapping coarsely).

"Karen!" Peggy shouts in alarm, when things go from worrying to potentially dangerous, the small rocks cascading down towards her. "Karen, don't push too far!" she shouts, trying to warn her. "If you don't feel you're secure, come back down, we can make another attempt!"