Either you are very brave and confident or have a death wish. Those are the two possible mindsets if you decide to cross a busy street in Vietnam. This video shows a man crossing a street in Saigon while cars, buses, and scooters whiz by. None of them stop and only a couple scooter riders slow down even slightly.
It must take nerves of steel. I can't imagine even considering crossing the street while escorting children.
At Twisted Sifter, you can see more terrifying videos of people crossing the street in Vietnam and surviving.