Mr Malloy said: "We are trained and told to communicate with young offenders, any offenders for that matter, in language they understand. You have got to use language appropriate to those people so they understand exactly what you are doing.
"We felt we had to discipline the young boys and that's the language we used to make them understand the gravity of the crime they had committed."
He added: "It was a disgraceful crime. We considered it at length in the retiring room and it was the appropriate statement that we agreed on."