It's never been common knowledge before now, before last night in fact, that you can just rock up to the Amex without a ticket, jump the turnstiles and lose yourself in the crowd. It'll be all over the Premier League by now.
Quite. The smoke bombs could easily have triggered an asthma attack or exacerbated breathing difficulties to anyone in the vicinity already suffering from these. And the long strobe sequence could have triggered an epileptic fit. The stewarding inside the away area failed in their duty of care...