6-year-old Toby went to the local skatepark with his older brother, Marcus, and Marcus's teenage friend, Kyle, whom Toby absolutely idolised and constantly tried to copy.
While they were there, a younger boy accidentally rode his scooter across Marcus’s path. Marcus immediately kicked the front tyre of the boy's scooter and yelled, "Get out of the way, you idiot!" while striking his own skateboard against the concrete ramp in a threatening motion. Kyle laughed and clapped, saying "Nice one, Marcus!"
Toby watched this intently. Later that evening, back in their driveway, Toby was playing with his younger sister's toy trike. When the trike got in his way, Toby kicked the front wheel of the trike, slammed his toy spade onto the tarmac, and shouted, "Get out of the way, you idiot!" at his sister.
Briefly outline how this extract could be linked to the key theme of external influences on children's behaviour. Support your answer with evidence from the extract.