Thread:AustinDR/@comment-30079834-20190614013513/@comment-2175012-20190614015411

He's PE in the novella. The novella outright states that Sharptooth "breathed the air of the Great Valley with evil intent." The novella makes it more than clear that Sharptooth killed more out of pleasure than necessity and had an ego which he felt was bruised by Little Foot and his friends. Hence why he spends the novel trying to kill them gruesomely.

In short, he is more serial killer than predator. The novel goes more into his mind than the film does.