Need the context here—- what book or story are you discussing? You will need to post again or respond and then I can help you.
Answer:
The detail, "And someone gave little Davy Hutchinson a few pebbles", contributes to the text because his mother was the one being stoned, but the person who gave him some pebbles was suggesting that he needed to start participating at a young age, just as everyone else did.
A more natural and efficient way to run (last one)
