Related for Megillah 48:5
ור' יהודה התם באבנתא דליבא תליא מילתא והא קא מיכוין וידע הכא משום הנאה הוא והא לית ליה הנאה
What says R. Judah to this? In that case all depends on the understanding of the heart, ... and the expounder directs his mind and knows, but here it is because of the benefit [he derives from light], and this one derives no benefit.
Tosefta Megillah
One who leads the responsive recitation of the Shema, or blesses over fruit or over matzah, behold, he should not answer "amen" after himself. If he answered ["amen" after his own prayer], behold, this is how ignoramuses act. We do not answer with either an "orphaned amen" (i.e., where one does not know to what blessing he is saying "amen"), or a "truncated [amen]" (i.e., where one does not pronounce the entire word). Ben Azzai says, one who answers with an "orphaned amen" -- his children will be orphaned; with a "truncated [amen]," his days will be truncated. But whoever prolongs [his amen], his days and years will be prolonged.
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