When Sharptooth is killed at the end of the first book.
Also, when Quetzalcoatlus pterosaurs scavenge his dead body.
When Styra's Dad charges into Sharptooth, knocking him to the ground, while yelling "Leave my daughter's friend alone!", when Sharptooth was attacking Dragonfly. Earlier, Styra's Dad hated Dragonfly, and almost killed him, because he is a carnivore.