The calmest person in the room usually ends up deciding how the room goes.

Rooms take their temperature from whoever is steadiest. While everyone else escalates, the person who stays level becomes the one others look at, not because they argued best but because they are visibly still thinking. Calm reads as certainty, and a nervous group will follow certainty almost anywhere.

Practise in small rooms first. A tense group project, a kitchen where two people are annoyed, a team down by ten with four minutes left. Slow your voice half a step and ask a plain question about what happens next. Watch how fast the volume around you drops to match.