His parents are not unharmed. There might be some blood visible on his clothes.
He leads her to the staircase. One flight down, a man and a woman are lying with multiple stab wounds. The woman is still breathing, barely. The man isn't.
"I'm going to try to heal her as fast as I can, okay?"
It's faster when it's one person and they aren't deliberately trying to screw with her familiarity.
Eventually wounds close, lost blood gets regained, and Liam's mother's eyes open.
"I didn't get here in time to save him," Promise apologizes, indicating the dead man. "I'm so sorry."
"He left. I tried to keep him talking long enough to be able to cast on him but he was compensating for that and by the time I would have been ready to try something that would go around that he was holding Liam. ...He also told me Liam's name. I'm sorry." She heals Liam of whatever's ailing him.
"I've healed you both. Do you need anything else from me right now?"
"I don't think so. I should call someone. Tell the police what happened." For the moment she's busy hugging Liam.
And then Promise turns invisible and goes back up to the roof and flies back to her house and emails Quinn.
I assume it is still illegal to kill people even if given a credible reason to believe that another party will kill fewer if one does. Is it also still illegal to kill people if they belong to the Slaughterhouse Nine? I'm not sure I can trust my assessment of public opinion on that one.
The Slaughterhouse Nine are among the few people to have kill orders on them. Questionably legal, but no one with a kill order has ever challenged it in court. Killing any member of the Nine is not only legal but may come with a large bounty most of which is donated in advance by families of their victims.
How responsible am I for collateral damage? If someone with a kill order is holding a hostage...?
It does not confer immunity to liability for collateral damage. If you level a building containing one of those few people you'd be as liable for the damage as you otherwise would be, just not for the death. In the case of the hostage, if it's foreseeable that the criminal will kill them if provoked and you provoke them, you can be charged or sued. Necessity is still a defense, but this situation is also safer to avoid if possible.
What if I have a shot at killing them but the hostage would be put at risk?
A kill order is a license to kill one person, it does not authorize whatever it takes to achieve that goal.
No guns, but if someone's holding a hostage and I think I can get the one and not the other through a gate to a fatal environment but if my reflexes are off I can't...?
In general, killing people is highly likely to get you in legal trouble. You might ultimately win, but it should be avoided unless it is the lesser of two clearly discernible evils.
Most of the time it doesn't get that far: we lawyers charge a lot for that, and of course either side could lose at trial. So they tend to be settled for some smaller amount of money in exchange for not suing.
The Slaughterhouse Nine are in town. They're collectively considered a threat on the level of an Endbringer or Nilbog, but we do have the names of two of them. Would you be willing to help oppose them? If so, come speak to us as soon as possible.
There she flies.
They have video and pictures, sorted by member. It ranges from larger quantities of footage of Crawler and Jack Slash (in some of which he is smiling for the camera) to barely any of Cherish. Some of the video is out of date, and Crawler in particular may have grown since then.
"The ones we have names for are Burnscar and Mannequin. Should you have the chance, neutralize them as quickly as practical." The Director slides over a piece of paper with ordinary sticky notes labeled "Burnscar" and "Mannequin." If Promise removes them, it contains the former's first name and the latter's surname.