It can pay to pick the right time and place for a scrap. Evidently a lull in play at Anfield was neither the most opportune moment nor the best spot for Mikel Arteta to challenge Jurgen Klopp to a touchline dance.
They really went for each other, or as much as managers ever do, with bulging eyes and fruity words before support staff from either side stopped the whole thing from getting too silly.
They were each booked for the tussle, which came 31 minutes in and a few seconds after Sadio Mane caught Takehiro Tomiyasu during a challenge for a high ball.