The title of the episode is a dictum attributed to ancient Greek philosopher and mathematician Pythagoras. It literally translates to "Don't poke fire with a knife"; in other words, "don't throw oil on the fire, don't worsen an already agitated situation".
The two men seen walking on the beach at the end, right before Lainis throws the necklace in the sea, are director Sotiris Tsafoulias's and leading actor Pygmalion Dadakaridis's fathers.