Persuade or Interfere?
Use Persuade when one PC tries to get another PC to agree to a course of action. Use Interfere when one PC has initiated a course of action, and another PC tries to stop or foil them.
If one PC Persuades another, the other PC can Interfere with that attempt at persuasion (by exercising willpower, bluffing, etc.).
The swyn is dead, the children rescued, and they're getting ready to head home. But Vahid doesn't want to go. "There's so much here to learn! We can't just leave!"
Rhianna is resisting, so I direct Vahid's player to this move. He asks her player if he could possibly convince her.
Rhianna's player very quickly says "No." I ask what that looks like, how Vahid can tell she won't budge. "Oh I lose it. 'Dammit it, Vahid. We're going and that's final!"
Vahid replies with "Fine. Leave then. But I'm staying. I can make my own way home."
Rhianna sighs, pinches the bridge of her nose, and very calmly says. "No, Vahid. You won't. You will get lost. And die. Please come with us." So now she is pressing him*.*
But Vahid doesn't cave. "You could convince me," he says, "But you'll have to roll. And I'll Interfere by being stubborn as hell." Rhianna says she'll roll Persuade, and Vahid rolls to Interfere (with WIS, for willpower). He gets an 11, and Rhianna decides to keep
pressuring him and roll with disadvantage. "I Aid," says Blodwen. "I step up behind Rhianna and give him the doe eyes. 'Vahid. Please.'" We agree that this would help, and the advantage from her Aid cancels out the disadvantage from Vahid Interfering.
"Okay, so I'm rolling +CHA, then? That's it?" It is, and she gets a 10. If Vahid agrees to come now, with no more discussion, he'll mark XP. But if he refuses, he has to reveal how they could convince him.
"Okay, okay…I'll come. But only if you let me put sanctifying marks on the entrances. And promise me that we'll come back to explore this place. And don't tell anyone else about it. Deal?"
I clarify that he's revealing how they can convince him, rather than agreeing outright. If he wants the XP, he has to just agree without those caveats. "Yup!" he says.
"Fine," sighs Rhianna. "You've got ten minutes. Go make your marks. Blodwen, keep an eye on him."