In hopes of not seeming condesending or rambly .
This is a Role playing game. Where you play a role, a person other then you the gamer. How is your character, the one your playing, and trying to be per the very first word know you are incapable of beating Raphael because he is several levels above you (a game mechanic that your character doesn't know) your character could draw the conclussion do to what Raphael has done, and is that attacking him isn't wise, and quite possibly lethal. or that he may need tools, or whatever. What your character knows is that he is offering to cure you, he is a cambion so he probably wants something in return. Raph is being vague for a reason, he wants you to accept right away. He's dangling this out to lure you in, there is no reason he'd start in on what he'll need ect. he's offering you what you want.
more likely to accept Raph's offer if he says. "I can cure you." or is it more likely you'll accept if he says 'Well I can possibly cure you, but I'm going to need a few things, and you'll have to sell me your soul in a legally binding contract." which would you chose the first offer or the second?
think alot of you all are missing the point of RPG's, all the we need more, we need clarity, we need this. That's you the gamer crying that because it's basic human nature to want these things. Yet in real life we dont' have all these answers, nothing is black and white, and we have to look for them. It should be the same in RPG, they already hand out alot of stuff, but they are wanting you all to playthrough several things as your Character, let you draw conclusions that your character would, find out the consequences of your characters actions as you play. It's why it's called an RPG, and per an RPG standpoint it's very good. Far better then others out there, which aren't really RPG no matter the label, they're more hack and slash.
More about Ethiel again we as our character doesn't know she's a hag, even if we beat the insight check we don't know she's a hag, or whats going to happen to the brothers. We as are characters may never find out. What we do know is two men are threatening a seeming innocent old lady (unless we pass our insight check) we don't know. Later on we may or may not find out what happens, which leads to more revelations. Which may very well make you regret your choice, yet just like in real life (which RPG's are spose to be a reflection of) you don't have all the answers, you won't know right away about the consequences if at all. Until you explore them to there end, are find the brothers dead in this case.