According to the UK’s Mirror, Aidan Turner was talking to a fan who had her handbag stolen during the conversation. And then he took action.
“He quickly managed to catch up with the thief, pulling him off his bike and grabbing the handbag.”
The article explains that Turner isn’t actually as short as his character (seriously) and after the event he said,
“It’s great to be a real hero for a change rather than just an on-screen one. I think the rescue though was more like something from Indiana Jones than the Hobbit.”
You can read the whole story right here.