How would that little child know?

The trigger was pressed; the bullet shot out of the barrel. A man looking through his window collapsed on the spot. The trigger was pressed a second time. Another shot fired.
The water carrier's water-bag burst. He too collapsed. His blood, mixed with water, started flowing on the road.
The third shot. This time it was off target. The bullet simply went through a damp wall.
The fourth bullet hit the back of an elderly woman. She died instantly--without a scream.
Nobody was killed. Nobody was injured. That was the fifth and sixth bullet.
The man was enraged. Suddenly he spotted a child sprinting across the road. He turned his pistol in his direction.
'What are you doing?' his companion said.
'You have no rounds to fire.'
'You keep quiet! How would that little child know?'