Related su Genesi 35:71

Why did they say one short [Beracha (blessing)]? In the place where they said to be long, one is not allowed to be short, [and in the place where they said] to be short, one is not allowed to be long. [In the place where they said] to seal off [the Beracha], one is not allowed not to seal off, [in the place where they said] not to seal off [the Beracha], one is not allowed to seal off. [In the place where they said] to begin [the Beracha] with [the word] Baruch (Blessed), one is not allowed not to begin with Baruch, [in the place where they said] not to begin [the Beracha] with Baruch, one is not allowed to begin with Baruch. [In the place where they said] to bend down, one is not allowed not to bend down , [and in the place where they said] not to bend down, one is not allowed to bend down.

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.