"Malfoy's got detention! I could sing!"
"Don't," Harry advised her.
Chuckling about Malfoy, they waited, Norbert thrashing about in his crate. About ten minutes later, four broomsticks came swooping down out of the darkness.
Charlie's friends were a cheery lot. They  showed Harry and Hermione the harness they'd  rigged up, so they  could suspend Norbert between them . They  all helped buckle Norbert safely into it and then Harry and Hermione shook hands with the oth-ers and thanked them very much.
At last, Norbert was going... going... gone.
(Harry Potter and the Sorcerer's Stone)
It seems that ,,, and  refer to ‘Charlie's friends’, yet who dose  refer to?
Who does ‘they’ refer to?
(1) Charlie’s four friends who are going to visit Charlie taking the little dragon.
(2) Charlie’s four friends plus Harry and Hermione.
(3) Harry and Hermione