Divergence is the 4th chapter of Brisingr. It takes place from the point of view of Eragon.
Summary[]
Eragon and Roran rescue Katrina while Saphira hunts down the last Lethrblaka. Eragon also discovers Sloan, his eyes pecked out by the Ra'zac. Unsure what to do, Eragon sends him to sleep using magic for a time.