777 has been evacuated without injury down the slides with a suspected engine fire. In large measure due to an assertive but composed crew who effectively paced the evacuation to make sure no-one was hurt. They had the advantage that they could see the ´fire´and the fire crew so knew they had time.Not so obvious if you think the fire is under your feet, but it is certainly the case that how the crew behave can affect how many people are injured. So whether ´screaming like a banshee´is an accurate description of her behaviour or was appropriate in the circumstances is subjective - just like this thread.