What challenges did percy jackson face in chapter 4 in the lightning theif

In Chapter Four of The Lightning Thief, Percy faces the challenge presented by the fact that he saw the three Fates in the chapter prior.  Both his mother and best friend, Grover, are terrified for him, and his mother drives frantically in an attempt to get Percy safely to Camp Half-Blood.  The fact that Percy saw the three Fates, Grover tells him, means that he is about to die: a challenge indeed.  As the group nears the camp's boundary, Percy realizes that they are being pursued by the Minotaur: a bullish beast that is frightening and terribly strong.  Percy's mother tries to hurry Percy toward the camp boundary, and the monster snatches her, and she "dissolved before [Percy's] eyes."  He gets angry now, and he takes on the Minotaur himself, eventually stabbing the monster with its own horn, defeating him.  Therefore, Percy's challenges in this chapter are largely physical, though he does have to begin to contend with his grief over his perceived loss of his mother.

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