Sometimes I can tell when my current DM fudges a roll to miss an attack or reduce damage. He has a tell in the specific way he pauses and breathes before announcing the roll, then tries to hurry to the next turn, which only seems to happen when someone is in a life-or-death scenario, but “luckily” survives.
Should I let him know he has a tell? Will it be less fun (or more stressful) for him if he knows I know?
I would let him know that he has a tell, yeah. As for whether or not rolls should get fudged, I guess it depends on what you’re trying to get out of the game. For me and my players, my emphasis is on the continuity of the story I’m telling, so I tend to fudge rolls to keep things moving along.
Yeah we always played the same, number one focus was on the story. So if a dice roll was likely to completely trash the story continuity, everybody kind of accepted a little fudging now and then. But only for that very specific reason.