This is excellent advise. I have told this to my own kids, and my brother the peace officer to his. There have been more than one instance where two children were approached and threatened with a gun. One ran, the other complied with the threat. Only the runner survived. Running from the threat of a gun is excellent advise, especially for a child.
If the child had a gun to resist with, run to cover then shoot the person who pursues you.
Unfortunately, a great many states have legislated that children must be unarmed victims. Children in school are now not even allowed to have a pocket knife!
This would be of relevance if the child that survived had gone to Mr. Stuber's escape training, and the other had parents like my wife and I, who do not teach stranger danger. Was it the case?