I would note that the Question who has domain over the Self is Who, not Why. The question of Why is a question of Purpose, not the Self, and I think Pierre and Fleur actually answers this better than George.
And I figured best to get around to this.
Who is about the person. You must be strong of heart, weak of mind, gifted in the ways of the blade, and a lousy musician. Answering who they are, while this is notable, this is their role in society.
Why is very much as much or even more so of a personal question then who. As this asks why they do things, one lousy musician may do it for the sake of fulfilling their dead brother's dreams, while the other does it to rake in money. Answering why is asking about the self, it's a question of why you do the things you do. Who is more about an external perception of the person, as the only way to define yourself is through your interactions with others. Why, doesn't need such a thing and is instead about their ideals, and their wants and desires.
How is their means of pursuing the goal. The way they wish to accomplish their goals, be it by stealth, conflict, or deception.
What questions the obstacles in the pursuit of their goals.
When asks when you will give up on your goals, and how much dedication you will take with them.
Where asks the places for those goals. If My Goal is to be a bard, a good answer would be the towns, and cities where others dwell.
Why, in a sense is the most instrumental question, it's about the goals and drives themselves. Why would you do this to yourself? Why would you take on such a risk, when the world has gone to crap, and the people you love are dying. Yes, Ideals are great, but no one truly believes them. Especially, not the people who say that's why they do it themself. Look at Pierre he wants to stay at his home and farm, why he'd do it to himself isn't to feed everyone it's to make his life easier, and avoid danger. He's actively lying about the answer even if we took it as an acceptable one. Yes, he may believe it to be true, but it's clearly not. Fluer? Same Deal she may wish to hunt, for the good of her village, but she's not doing it to make the wilds safer, it's so that she can make the woods safer, so her why isn't an ideal as well.
How do we know this? Let's look at the posts about them.
This is such a stupid idea. This is such a stupid, stupid idea. The thought repeats in Pierre's head as the revelation strikes him true. He's a simple man is Pierre. He seeks a life with little to no risk or what risk there is he wishes to be made manageable. So when something is proferred to him claiming to eliminate or otherwise handle certain risks?
A means to ensure that he'd never again have to venture from his farm, able to wield his power to tend to the fields such that all would have what they'd need and not throw themselves into pointless suicidal ventures such as this. A means to see to it that the tragedies that lead him to becoming a farmer rather than a hunter such as his father was. A means to help others without needing to venture beyond his walls...
There is risk in answering Pierre realizes. What if he's wrong? What if his answer is unworthy? Would he be smote on the spot or his torture dragged out for centuries? Oh sure these things claim that there is no price but that can't be true. Must be a lie.
But there's risk in not answering as well the very same ones that exist in answering truth be told. Thus it only stands to reason that if there is some reward for answering and the punishment for both outcomes is the same either way then…
His mouth opens and his answers spill forth.
This is all we get, about his motivations. Now, let's compare it to what we see in the response and whether or not it's acceptable.
To ensure that all may eat freely and readily.
And We get a maybe right? I mean, he clearly is tending to his farm to feed others. Except his concept of all, is clearly different then what Pierre is actually thinking why do we know this? Because, this is a time of strife, and he's not really thinking about the world, he's thinking about his village when he's saying such a thing, and it's limited by another axis time. Once he's gone the tending of the farms will go with him. This is where the answer strikes hollow to me, as Pierre even if we allowed him the magic he wants wouldn't accomplish or even seek the goal he's stating, as he'd simply seek to feed his village.
Fleur stood in open astonishment as she watched Pierre answer these strange lights. What madness possessed him to do this she wondered. Was it desperation? Fear for his own life maybe? Probably, she immediately conceded.
Still, as the six lights seemed to sit there, considering, she too considered what they proposed. Magic but without chance. Wonder without harm. If what they offered was true then…
Survival was paramount. It was always the most important thing to see to above all else. A hunter must take pains to do all they can to ensure they return from the hunt lest the settlement starve. So if she were to ignore these things and the reward they claimed to promise then… Would that not be a betrayal of that very facet?
To use magic without fear… It was a chance, true. But it was a chance too promising to pass up. She pauses, considers carefully the words she will speak…
Then casts them to the air.
To ensure that the wilds remain safe for all to traverse.
Right off the Bat, without quoting I guarantee you she'd not like everyone to be able to freely traverse the wilds. Simply because of the food problem, and the fact that it's protection from outside influences in a sense, and she's the type of person to actually use it for such, if it's in her interests.
And She's not saying remain safe in the wilds for her goal, it's survival. Her Question should be more along the lines of to. I do this so, I can survive, so that I may come back safely from every hunt. This may be a selfish way of putting it yes, but that's a far more accurate answer of her actual thoughts ideal.
Though, this is my opinion on them, I may just by cynical.