OK, so I've been mulling this over for a bit. There is an old standby that says that if failing a roll wouldn't result in anything, don't call for a roll. I generally interpret it as thus:
1) If the roll has no real relevance to the campaign, don't call for a roll
2) If the PC can't possibly fail or succeed, don't call for a roll
3) (Recently learned) If the player has recently made the roll doing something similar, don't call for a roll. Use the recent result instead.
Now, that said, I wanted advice on how to handle a scene. I was planning on having an NPC introduce himself by essentially showing the groups seer a vision of hope - considering her visions are by nature always graphic, horrible and depressing, this should come as quite a shock. I was considering this as a mental attack that would place an aspect on her for the duration of the story and hopefully suggest a new permanent aspect in the future. I'm considering this as an autotakeout - so I'm thinking I have three options:
A) Big mental attack, enough to one shot her mental stress attack. Give her the option of trying to fight it off, but compel her not to.
B) Massive mental attack. Don't bother letting her roll as per the rules above.
C) Find another mechanical way of modeling this?
I should mention, this is a plot device, not really screwing the players over so much as making sure they pay attention to the badass NPC. If I go with A, the Aspect should probably screw her over a little, so I'm leaning towards that, even if I have to compel her with 2-3 Fate points.
My question is, am I trying to railroad the players doing this? I'm new to this and trying to determine how best to accomplish this. The best I can do at the moment seems to be railroading them into wanting something (since as PCs, the players haven't really given their characters much by way of wants, needs or passions.) My best guess on how to handle this situation is to railroad them into a goal, then let them figure out how best to accomplish that goal (while planning out the obstacles to the most obvious routes to that goal and preparing to improvise when they take a less obvious route.)