It doesn't have to be en masse. They've got spotters all over the away end - and don't be surprised if City have too - and just a single person saying something can lead to them getting nicked. I had to have a word with 2 fans on Sunday who were chanting "Murderers" in response to the "Liverpool" chant because it could've seen them get lifted. And yes, for some reason Murderers is classed as a tragedy chant over there even though it's about Heysel and not Hillsborough, and is effectively a reverse tragedy chant given that it mocks the perpetrators rather than the victims. How do I know this? Well, a mate of mine got arrested for it last season and was originally slapped with a 3 year FBO. He got a lawyer involved who successfully drove a coach and horses through the prosecution case as there were holes in it, and as such got the FBO removed and a more lenient punishment handed down. Yet City have still banned him for 3 years and said what he did was equivalent to racism FFS! Oh, and while he was banned by City pending the appeal they were still taking his season ticket direct debit money AND his cup scheme money.