Acts 22:9 clarifies the companions heard the sound but not the articulate speech — resolving the apparent contradiction.

Acts 26:13 adds that the heavenly light shone around the companions, consistent with them seeing the light.

Acts 26:14 adds that all fell to the ground — a detail not in this verse, showing variation in the accounts.

Daniel 10:7 parallels this: companions saw no vision but quaked — similar to hearing a voice but seeing no one.