In Seven Deadly Sins (Nanatsu no Taizai) episode 14 "Master of the Sun", we find out that even the 10 Commandments can be affected by their own (or other members') commandments, as Galand is turned to stone for breaking his word with Escanor.
In episode 19 "Meliodas vs The Ten Commandments", Estarossa kills Meliodas in front of the other 9 commandments, including Grayroad. But in episode 23 "The Hero Rises!", we find out that Grayroad's Pacifism Commandment causes anyone killing in his presence to "lose their remaining time".
In episode 22 "Return of the Sins", we find out about Meliodas's curse. Is the fact that technically Meliodas cannot die what saved Estarossa from Grayroad's Commandment, or is there something more to it?