Chamomile wrote:It's that named, plot-important NPCs with pre-determined personalities shouldn't have reaction rolls.
So why should named, plot-important NPCs with detailed equipment lists, stats, and fighting styles and power trees have attack rolls then? Why can't the DM just decide 'Bob hits you this round because he has a 30 STR, the entire Weapon Focus feat tree, he's on higher ground with the sun to his back, he takes meticulous care of his +5 sword made of special imported mithril, and is a veteran of several wars specifically against elves--in fact he's famed for leading a successful charge against the Forest Blade elves, which you come from, and he's intimately familiar with your fighting style'.
Of course we know why the DM just doesn't declare it; it's because even with that relatively exhaustive list he's still missing a lot of variables that would affect his performance. And this is before the PC presents his own rebuttal with his own list of bullshit about how he's going to counter Captain Bob's advantages and why in fact the sword swing should have missed. That's what the roll is for.
Even if you detail Captain Bob's personality and backstory you're not going to catch everything. Captain Bob deciding to give your party a fair shake might be totally determined on whether his wife was chewing him out this morning and his boss saying that he wants him to be tougher on crime. And if you really want to make things hairy you could have it so that his wife made him his favorite breakfast and told him that she's pregnant BUT his boss said that he wants him to be tougher on crime.
All that shit could have possibly happened before Captain Bob stopped the PCs on a routine search and found them without their identification papers. And you know what? Even if you could put that amount of detail into the game to determine why Captain Bob is going to arrest the PCs or let that go not only does it slow the game down but it's also extremely suspicious; DMs who spend way too much time thinking about minute details that determine a PC's chance of success or failure come off as really railroady. It's best just to leave it to the die roll and invent reasons afterwards if anyone really cares.