The next morning, they are attacked by the Sharptooth, but they manage to escape through a tunnel that is too small for him to follow. Beyond this, they discover the landmarks mentioned by Littlefoot's mother. Cera stubbornly decides to go another way and insults Littlefoot's mother, causing him to attack her in anger. The ensuing fight leads to the others following Cera, and Littlefoot is forced to continue alone. However, when Ducky and Spike become endangered by lava and Petrie gets stuck in a tar pit, Littlefoot returns to rescue them. Cera gets ambushed by a pack of "domeheads" who are also living in the Mountains that Burn; the rest of the group pose as a tar monster, scaring away the domeheads and frightening Cera. When she realizes who it really is, Cera angrily leaves the group. It is not long, however, until she gives in to her guilt, recognizing that her stubbornness and selfishness put others in danger. Later, while crossing a pond, Petrie overhears the Sharptooth nearby. The group devises a scheme to lure him to the pond and drown him in the deep side using a nearby boulder. During the ensuing struggle, a draft from the Sharptooth's nostrils enables Petrie to fly for the first time.