Here what you saying, I just disagree. I find that letting a player 'hand wave' that they did something to over rule the game system just isn't giving respect to the other player. They didn't manage to kill the person out right, so their 'description' of a perfect shot gets replaced by something else in the narrative (discussed previously, struggle, stumble, whatever). Pretty much all roleplaying boils down to this. Statement of intent, roll, see how roll matches statement of intent, work to fit. It doesn't add any more rolls in to have the 'instantly fatal headshot' get replaced by what the roll actually said, in the same way the person then makes their roll to see if they can coldly finish the person off. Not sure how your then saying the Alien would need to make such rules, that would again just be blatantly going against the rules, how their attacks work is pretty clearly laid out and they aren't player characters. I think your exaggeration for effect actually undermines your otherwise good point.
To each their own. The OP asked others how they would handle it, that's how I would. Generally I'm happy to be loose with the rules, generally not when it comes down to player vs player as that can quickly impede on someone else's fun. But in any case thanks for the discussion Oddball.
The problem here is that if you read the description of both coup de grace and broken, you'll see that your reasoning doesn't hold up.
You're saying that they should roll on the crit table because "the player might move at the last second" or whatever.
But someone who is broken is not unconscious (unless specifically stated so by a crit roll), and certainly not incapable of movement. And yet you don't have to stand there, repeatedly attacking them and rolling on the crit table hoping to get a killing crit.
The description of Broken states that the person can crawl and mumble through the pain. And yet the description for Coup de Grace is: "
A broken character is defenseless. If it's a human being and you want to kill your target outright, you must
fail an
empathy test."
And I would argue that so is anyone who is standing right in front of someone who is aiming a gun at the back of their head without them knowing about it.
Rolling on the crit table is silly. Because the person is defenseless. Furthermore nobody is "hand waving" anything here. First of all, the player has to succeed in an opposed stealth check (Mobility vs Observation) and then, after that, they
still have to fail their empathy test to actually perform the murder (unless they have the cold-blooded talent).
How is that hand waving?
In fact, if you're so hell-bent on following the rules, the player should not only roll for a crit, he should roll to hit from that 2cm (or whatever) distance... I mean, rules are rules, right? Oh and don't forget to force the player to roll for damage to see if he actually crits or if he just slightly injures the other player by shooting him in the back of the head with a shotgun.
I'm sorry that I'm comming off as flippant here, but it's this kind of rules slavery that I've seen split up many groups. The sheer absurdity that comes out of this kind of manic adherence to the rules has led to some truly absurd situations.
Sometimes you really do have to let go of the rules and "hand wave" (as you call it) the situation.
Just to put it into a different perspective, let's call up a different hypothetical scenario.
Say the same player instead ties up the other player and then decides to shoot it in the head.
Does he still have to roll to hit?
And then a damage roll to see if he crits?
And then roll on the crit table?
And then
after that, finally roll for the coup de grace.
Or would you simply let him roll for coup de grace immediately?
I'm genuinely curious, because to me the situations are not different. The player is completely unawares of the imminent threat in the first situation, but in the second, he might be tied up but he's still able to flail his head around to make it harder to hit him.
(edited for clarity and spelling)