Were the men with Paul knocked to the ground?

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Yes, they fell to the ground.

And when we were all fallen to the earth, I heard a voice speaking unto me, and saying in the Hebrew tongue, Saul, Saul, why persecutest thou me? Acts 26:14

No, they remained standing.

And the men which journeyed with him stood speechless, hearing a voice, but seeing no man. Acts 9:7