When our game reaches the stage where a leading Premier League manager is so angry, so desperate for retribution, so keen for confrontation, so eager to shift the blame for another knife-edge performance, that he pulls a hamstring in his headlong rush to intimidate the fourth official in full view of millions watching at home and around the world, it feels as if the issue of touchline behaviour in English football has reached a tipping point.
On Sunday, it was Jurgen Klopp, one of the most admired, charismatic and influential men in English football, who was charging down the side of the Anfield pitch towards John Brooks like a madman near the end of a tumultuous win over Spurs and then clutching the back of his leg.