So a train fare dodger decides to walk in with me through the ticket barriers without him paying. I knew what he did but I thought I'd leave it because it happens to people. But as he was walking off he turned back around to see if I was suspicious. That's when I decided to flick the switch and not be taken for a mug and called him over. I asked him if he walked in with me and he obviously denied it. I then held him strongly and took him back to the ticket barriers. After a bit of a standing wrestling and shouting match the customer service person told him to get back out and I carried on with my travels. Is it lawful to to do something like this? I mean he basically stole from me as I'm the one who paid for the fare not him.