Why was there no breach of duty in Mullins v Richards?

Why was there no breach of duty in Mullins v Richards?

In this case, a reasonable 15-year-old would not have foreseen any injury arising from the pair’s game, and so would not have taken any additional steps to safeguard the claimant from harm. Accordingly, the defendant acted as a reasonable child would, and was not in breach.

See also  What's a whole life insurance policy?