Communication During Encounters (PSR Supplement)
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Generally, there is no limit to how much you can communicate to other players during an encounter.
However, you can meaningfully communicate to other NPCs only on your turn — or on the NPC's turn if they initiate communication — through brief spoken words or gestures. The Influence action is required for more complex communication, or communication impactful enough to positively affect attitude with an ability check.
Sometimes brief spoken words is still impactful enough to change attitude — such as admitting to a murder, or performing a vulgar gesture — without an ability check and therefore without needing the Influence action.