"Sure why not, gonna be short on discretionary income..." List.

Done! "Take care."

"Thanks!"

The demon goes to Hell.

The other circles open for him include one with a gag; is it otherwise terrible or does it just have a gag.

It's not very nice.

Summoner?

Some lady he doesn't recognize.

He writes home instead and then spies on her. Published works?

Tedious blog posts about every fucking thing from the shape of teabags to her neighbor's annoying mullberry tree to her grandchildren's ungrateful behavior to, yep, irresponsible summoning behavior. Several crochet patterns.

Charming. Well, he can't take circles for him until she gives up. 

He could take random ones, with little audio player behind his ear to hopefully screen the gagged ones. He makes a note he's doing that.

It takes a while to catch one; they feel completely different and go fast.

...the audio recorder does not screen for gagged ones.

"...you're a kid," says the summoner.

He is an annoyed kid trying to feel pleased about falsifying a theory. "Gags are really annoying," says the audio player, "and it's safer to summon demons without them. Gags are really annoying and it's safer to summon demons without them."

"Oh, god, I don't have time for this, do you want to fix amputees before they bleed out for whatever you can extract from me or not."

He crushes the audio player. " - yes summoner."

She marches him over to a field hospital which is much more field than hospital for values of field that are exploded rubble and produces a hacksaw and starts forcing painkillers down people's throats and sawing through pinned limbs.

He can give them new ones.

He can't offer to get them a list of medical angels, or draw out most of the circles and pay for them, he can't say that he hasn't completed medical school but knows enough to drug them safely himself.

But he can give them new ones. He does that.

Eventually everybody is free and has all their limbs. The summoner stalks away from them, teeth gritted, and when she is behind half an exploded wall she looks at him flatly.

He wraps his wings around himself and looks back at her.

"I don't know how this works, I'm not a real summoner."

Nod. 

"So what do you want, or do you just follow me around forever now, or -"

He can't say. Because he's gagged. He can continue to not look inclined to hurt her and maybe she'll propose a new deal?

"Maybe you don't want anything? Does that mean I can dismiss you now? I don't know how this works -"

He wants to fucking talk but even if 'whatever I can extract from you' includes 'snap the binding' there's no way to get that without scaring her.

He sighs. He points at a rock on the ground.

...she gives him the rock.

"Okay. Thanks."