Does this make sense??::
When he finished speaking, silence prevailed amongst the crowds

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Yes, and I love how you used the word “prevailed.” So if I understood you correctly, you’re saying that the crowds remained silent even after he finished speaking, as if he said something really amazing?
Not sure about “crowds,” though. It would be only correct if you’re talking about many large groups of people. If it’s only one big group, you can use “crowd.”