Original: Idamante approaches him , but because the two have not seen each other for a long time , recognition is difficult . When Idomeneo finally realizes the youth he must sacrifice for the sake of his vow is his own child , he orders Idamante never to seek him out again .
Simplified: When Idomeneo finally realizes it is his own son he must kill , he tells Idamante to go away and never see him again .