I was just reading this story: http://news.bbc.co.uk/1/hi/uk/6290361.stm
What if it was you on that train in that cabin? What would you have done, if anything?
"I remember looking up and I recall a man I know now as Mr Mohammed was screaming and shouting and there was smoke issuing from his back."
He said: "I was shouting 'what have you done, what have you done?'"
The court heard that several members of the public gave chase to Mr Mohammed, including a 71-year-old former soldier who pursued him up an escalator.
What if it was you on that train in that cabin? What would you have done, if anything?