A ringing bell and a flat announcement herald the coming of every set restart, but through three rounds of the NRL season, the most controversial rule in rugby league remains shrouded in mystery.Everyone knows what it sounds like — you'll hear it at the game as much as you'll hear the referee blowing the pea out of it, the extraordinarily irritating Telstra whistle or the loudmouth fan who is so eager to let the officials know the opposition has, in fact, been doing it all day.Given how the NRL has expanded the six-again rule's remit from inside a team's 40-metre line to inside their 20, and the subsequent explosion of set restarts, that loudmouth might be right.Through three weeks, the application of the restarts has been confusing at best and chaotic at worst, for players, coaches and fans alike.Set restarts are up 67 per cent on last year, and over the past fortnight, there has been a restart every 27 play-the-balls, while the average margin of matches has been a whopping 18 points.Melbourne's Cameron Munster admitted his frustration last weekend, saying he was often not sure what the set restarts were for No wonder we are all so confused.But what is most baffling is the NRL's decision to ramp up the set restarts at all.Last season, as the NRL is not shy about telling people, was one of the most successful of recent times