In my humble, not-very-experienced opinion, I would have asked for the ejection of every fan that stepped onto the floor. If a player can't fight, then I'd think a fan
certainly can't run onto the floor while a game is in progress and engage in physical activity of any kind with a player. Based on that, I'd toss 'em. Secondly, what kind of sportsman ship is that ijit showing? Sportsmanship is for the players, coaches, officials,
and fans alike. Based on that, I'd toss 'em. Now, I'm only a first year official, but I've
been to games where a technical has been assesed on a crowd (can't find a rule in the rule book giving permission to do so, however...), so having seen and said that, I'd warn 'em once, then whack 'em
