Man tackled by train guard after approaching and asking questions

Footage has emerged of the moment a Perth teenager is tackled to the ground and arrested by transit officers while it was streamed live on Facebook.
In the video Kane Pattinson, 19, explains that he is returning to a train station where he alleges he was abused by transit officers for trying to help someone who was in trouble with the guards.
Three transit officers are waiting outside the station as Mr Pattinson approaches them to 'see what they have to say' about the altercation.
Mr Pattinson points the camera at one of the officers and asks him to rate his performance.
Moments later another officer moves in on Mr Pattinson and tells him he is under arrest before tackling him to the ground.The teenager repeatedly tells the officers they they are being live streamed as he is pinned to the ground.
'You're on live video, I haven't done anything wrong,' Mr Pattinson says. 'Someone help me, I've been abused.'
In the video description, Mr Pattinson says his dispute with the officers began when he aimed to help a man in trouble with the guards to walk away.
While Mr Pattinson insists he didn't do anything wrong, he concedes that he shouted at the officers during the initial confrontation.
'I needed to go back that way anyway so I thought I should record it to make sure I wasn't abused in anyway,' he said.
'Nobody was hurt in the making of this video and don't try this at home.'