In Harry Potter you eventually learn that to see Thestrals you need to whatch someone die. But Harry doesn't see them till Order of the Phoenix, but why? He watched his mother die, and in the fourth one he watches Cedric die.

  • Maybe you have to be looking fully at them. If I recall correctly, Harry only sees Cedric's body slump to the ground. – marcellothearcane Feb 23 at 21:56

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