If you did not try to stop the child from running and then the child got hurt. The legal principle in the future is: Negligence.
Negligence occur when a person display an act of carelessness or when a failed to care for something or when a person does not apply proper care to something.
Based on the given scenario the legal principle is an act of negligence because of the failure to stop the child from running which resulted in the child having injury.
Therefore the legal principle in the future is: Negligence.
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