Half-baked take.

Harry was what, 14 or 15? I think 14.
He didn't break down sobbing when Cedric was AK'd. It was the culmination of the trauma from the entire graveyard scene.

>Friend getting killed
>getting captured
>having his blood forcibly taken to revive magic satan
>taunted by satan and all these prominent adults in the wizarding community who are secret dark wizards
>forced to duel
>seeing his parents
>(book only) escaping with all these dark wizards trying to shoot you down

You all would shit your pants as well.