As Flat Dog arrives, Duncan attempts to kill her. However, he is quickly swallowed whole, only to be regurgitated moments later. Claire gives the Flat Dog the egg, which hatches into a baby crocodile, before she returns to her nest, leaving Claire, Princess, Brady, and Duncan free to escape.
This passage describes a scene from a narrative where a character named Duncan attempts to attack another character, Flat Dog, but fails.  The outcome leads to a change in the situation, with Claire and her family escaping.