Then the fairy will grab her and try to break her wings.

They're not hard to break. They're like tough leaves and they tear and Promise wakes up at once and screams.

She would explain herself but the stupid horrible person won't even understand the explanation, will she. She sits down and glares at her.

Well, Promise can't take off in this condition. She sobs instead.

Eventually she stops glaring and starts crying too.

Whatever this person is isn't a human. Has been implied to be some kind of mortal, but not a human kind.

Maybe this isn't the mortal world either.

Promise tries healing herself - less the ears -

- her wing knits back together.

Astounded blinking.

Now she's up in the air again.

"I'm going to leave and not come back - I don't care what you do, I can't die and I think you can - unless you write your name on the ground for me right now."

She glares. 

She picks up a stick.

She writes on the ground "STAY".

The name, if it's a name, will still be good a split second stale, so Promise doesn't watch her write, just reads it after - "That's not your name. You just tore my wing in half. I don't want to be anywhere near you while you can do it. Name or I leave you on your own."

"Don't you understand that'll make everything worse? More than twice as bad?"

"Can't hear you. If you want to make cunning arguments you have to write them, I don't trust you."

She's a really slow writer but she tries it. 

THAT WILL MAKE EVERYTHING WORSE. MORE THAN TWICE AS BAD. 

"More than twice as bad as my traveling companion ripping my fucking wing in half? Sounds awful, like I should just leave instead."

IT APARENTLY DIDNT AFECT YOU AT ALL.

"That came as a surprise to me, as it happens, though I'm sort of curious what you were planning to do to get around when I had a ripped wing and a broken leg."

EXPLAIN WHY YOU CANT LEAVE AND GET YOU TO AGREE NOT TO AND THEN NEGOTATE WITH SOMEONE FOR HEALING

"I bet you're not thrilled with the results. Why can't I leave? You might do something stupid, on account of being kinda stupid, and then something bad happens to me? So? Eventually you'll die. And I won't. You make the prospect of sticking with you very unappealing."

NO ONE ANYWHERE WILL HAVE ANYTHING TO DO WITH YOU

"Sounds lovely. People around here having anything to do with me sucks."

NOT - she scribbles that out - IT WON"T STOP PEOPLE FROM CAGING YOU OR CUTTING YOU UP FOR RESERCH

IT WILL STOP YOU FROM FINDING A COURT WHICH IS HOW YOU MAKE PEOPLE NOT DO THAT

"Well, apparently sorcery works here, so maybe I'd like to take my chances on self-defense if you can't keep your hands to yourself."

I PROMISE NOT TO DO IT AGAIN BEFORE WINTER UNLESS YOU TELL ME TO

"That's way too narrow for me to be getting on with."

WHY