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"Crying with fear and relief, they were escorted from the building," prosecutor Deanna Heer said.

Prosecutor Deanna Heer KC said weeks before the attack, the victim, who has not been named, was invited to join a Snapchat group formed in order to arrange a trip to the roller disco event.

Ms Heer said Harris invited the victim to his home on 29 January and while in his bedroom she recalled Harris being on the phone to a friend who said she was transgender.

"Having been attacked in the past because of her transgender identity, she denied it," Ms Heer said.

"Although she did not believe that Harris would use the knife, she felt intimidated and admitted that she was transgender," Ms Heer added.