Maxperson
Morkus from Orkus
In the example of the wizard with 1 hp, if I roll the damage dice, don't like the result, then change it, I'm fudging.
If I never roll the damage dice at all and declare that the successful attack roll (crit or otherwise) takes down but doesn't kill the PC, then I'm not fudging.
You are. You have fudged the required die roll into whatever damage is enough to knock him out. Just because you are choosing the result of that die roll and not actually rolling the die, does not mean you didn't fudge it. The rules required the die roll.
Again, the rules serve the DM, not the other way around.
I agree, but you doing so is still a form of fudging. The rules require a die roll and you as the DM decided the result of that die roll instead of rolling. That's fudging the roll. There is no effective difference between the DM who rolls 10 damage and fudges it down to 1, knocking the PC out, and the DM who doesn't roll and decides that it did 1, knocking the PC out.