While Crispin and Pitter are defending Whisper's grave from the ravens, the Archraven comes. The Archraven attacks Crispin. Crispin kills the Archraven, but is hurt in the process. Pitter uses the mendingmoss that was growing on Whisper's grave to heal Crispin.
When everyone gets back to Mistmantle, Pitter tells Cedar about the mendingmoss. The Queen orders that some is brought to Mistmantle. The swans are happy to give Cedar some mendingmoss.