What is the normal thing that they do it an Actor gets a sore throat.
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many times they have the actors meet in a sound studio to recite the same lines again and those clearer lines are added to the video. Studios do it largely when outside scenes can pick up distracting audio but its also done for a variety of other reasons including vocal problems and even changing lines altogether without re filming the scene
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Give them a lozenge and hope for the best.