Moment brave bystander was attacked by crazed dog and wrestled with it on the ground after animal turned on him when he tried to stop it mauling commuters at train station
- Shocking video shows vicious dog attack in South London railway station
- Footage shows crazed animal maul man who tried to stop dog’s rampage
- Horrifying attack took place at New Malden railway station on Friday night
- The dog was seized by officers and its owner, 22, was arrested
