LOL - I see what you're saying (even though I can listen to Trivium fairly contentedly, Heafy's godawful vocals notwithstanding) - but my point is more that behaviour like that from people at shows is unnecessary and eventually spoils things for everyone. I mean, there would have been Maiden fans in the crowd getting showered with whizz as well as it flew overhead, not to mention the distinct possibility that Maiden themselves ended up playing on a piss-soaked stage as a result.
Also, there were Trivium fans there who had travelled from America to see them with Maiden - they paid the same for their tickets as everyone else, and even more for their travel - were they not as entitled to witness an uninterrupted show as everyone else?