当调停者在场时，如果被处决的是好人，那么该玩家可能不会死亡。
旅店老板被处决了，但因为有调停者，他仍然活着。
调停者的技能是否发动由说书人判定，只要说书人愿意，连续5名善良阵营玩家被处决，调停者也没有拯救任何人。
疯子被处决了，但仍然活着。暴徒被处死，因为调停者喝醉了。一位好主教被流放并去世，因为调停者拯救了人们免于处决，而不是流放。第二天，调停者被处决，但因为调停者在场，他仍然活着。
Don't come out! Your ability keeps good players safe (at the Storyteller's discretion), and the evil team will want to remove you from play as soon as possible. Bluff as something undesirable to kill, like a Fool or a Goon, and hold that line until you have very good reason to reveal who you are.
You should always come out eventually, but how you choose to do so is up to you. For example, you may know a player you trust 100% is good, and reveal to them early and secretly. If your ability saves someone later, they will know immediately it was you. If you don't have someone you trust that much, then simply play carefully until you die, or until it's late enough in the game that people need to know who you are anyway.
Your ability is more potent in the late game, so survive as long as you can. The Storyteller is simply more likely to save a good player at a critical juncture as the game comes to a climax than they are to rescue someone from the town's blood thirst on the first day. Simply put, the longer you live, the better chance you will have of saving someone, so take whatever action you feel is necessary to make that happen.... within reason.
Wait for your ability to trigger before making any sort of reveal. Seeing someone be saved from execution unexpectedly will prime the good team to believe you are in play anyway, whereas revealing early and then seeing your ability activate may lean them towards believing some shenanigans are at play.
There's lots of reasons people may not die, so don't immediately assume it was you. Jumping the gun and coming out when in reality, a Sailor, Fool or Tea Lady's neighbour has just been saved from execution will paint a big target on your back, particularly if it is still early in the game.
The Devil's Advocate is your worst enemy - capable of mimicking your ability and protecting their evil cohorts on top of that. Thanks to how similar your abilities are, the Pacifist is a popular bluff for this devious minion - tread carefully if you think one is in play, and in general try to avoid giving the good team a reason to succumb to the paranoia that you're trying to trick them.
Either stay silent initially, or use the Pacifist as a backup bluff. Most Pacifists wait for several days before revealing that they are the Pacifist, so it will look perfectly normal. Alternatively, if the character bluff that you are attempting isn't going so well, switch to the Pacifist later in the game, or when put in the hot seat.
If a player is executed and does not die, immediately claim to be the Pacifist! The good team will probably begin to put together the pieces of the puzzle as to why that player didn't die, but in the meantime, you look extremely trustworthy. Even if the good team figures out the nature of the player's survival (due to such things as the Fool, Tea Lady, Devil's Advocate, or Sailor), you'll still look trustworthy, as that has not invalidated your bluff.
If you survive to the end and nobody has been saved from execution, blame the Storyteller. Sometimes, when the good team is winning by a significant margin, the Storyteller will not for not activate the Pacifist ability at all, so as to give the evil team a chance. This is a perfectly reasonable, although uncommon, thing to happen, so claiming that the Storyteller has made this decision is reasonable. Of course, if you are actually a Minion, and keen to die on the final day instead of your Demon, do your best to either ignore this argument, of make it very poorly.