I have been through several training events where the flight attendants evac the plane. It’s loud, and very convincing instructions shouted in your face, the PA/mega horn is also used. GET OUT, GET OUT, LEAVE EVERYTHING, LEAVE EVERYTHING THING, COME THIS WAY, COME THIS WAY. This is repeated over and over. That’s how they do it at my U.S. airline anyway. I’m sure it is the same at most others.