That is not necessarily true. An Amen Yesomah is if you answer after Toch K’dei Dibbur. Sometimes the Chazzan speaks faster than the average speech of people. You have the same amount of time to answer Amen (in regards to Amen Yesomah) whether or not the Chazzan continues. There is a separate issue that it is Assur to speak during Chazaras Hashatz, and thus it is not permitted to answer Amen after the Chazzan has begun the next Bracha.
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