One who is reading the Megilah, and simply cannot read עשרת בני המן in one breath – and at the same time, taking the time to ascertain that he is reading the proper “ואת” on the left column. I know that בדיעבד, one fulfills his obligation even if he does not read עשרת בני המן in one breath, and even if he reads SOME words of the Megilah by heart. Naturally then, the question is; if one cannot do both, which one should he do?
In such a case, one should rather read them not in one breath than reading orally. Sources: אם החסיר השומע בתחילתה או בסופה או ענין שלם – ראה…