To be honest, the fence was actually necessary, I have actually had people try to spit on me, and I have heard complaints over spitting on there before, and H&S again in terms of people falling off. Seriously though, it's more to do with spitting and stuff like that, as how the hell do you fall off a averaged height bridge? Trip and Bounce? They don't bother doing anything to the rapids which has problems with people, I believe it was climbing out the boat, or something to do with a bridge. I saw a youtube video and it was something serious, but I'm not sure what exactly it was but it was omething that could have ended quite badly.