Sherlock can barely deal with the coin she is trying to make.
It turns out that the pentagon that modified her perception of pain was not... quite... sufficient.
But she can't take the time to readjust. She summons the concentration to make coins out of what she's feeling, and as soon as she summons the concentration to stop, she tells Tony [enough] and spends a declawed star to declaw one of her new eight-pointed coins.
Her wish is extremely specific. She wants Bell back. Not a version incompletely reconstructed from her own knowledge or any other secondary information, but the same person who was destroyed in a nuclear explosion a minute ago. She wants Bell back, right here, unharmed and unchanged and with complete memories of her life up to the point where she was murdered.
And she expands her perspective on both Coin and her own house, so as to spot any more threats before they arrive.
There's nothing incoming on the house.
(Coin doesn't, actually, know where Bell's magic comes from, or she would never have done something so incomplete and foolish.)
Coin is receiving a report that the bomb has gone off and as near as anyone in Thirteen can determine it got its target. "Thank you," she tells the report-deliverer, "that will be all."
She has her suspending-contemplation-of-something-
"I -" Bell looks at the evils, and then throws herself forward and hugs Sherlock hard. "Fuck. Thank you."
She spends a hex.
"That should be better. Now. What do we do about Coin?"
"It's not? Oh my - Sherlock, you didn't even stop to boost that before...?"
Bell continuing to be dead was more unpleasant than the amount of pain required to make her stop. And Sherlock could not be quite certain that there wasn't a time limit involved, that any second spent tuning her masochism and experimenting with Tony to find a more pleasant delivery method might not be the particular second that carried her out of reach forever.
"I love you," mumbles Bell into Sherlock's shoulder. "I love you so much."
Dealing with Coin is urgent, but not urgent on a scale of minutes. They can stand here hugging each other and crying for a little while longer.
"I'm almost surprised you didn't kill her on the spot," Bell murmurs.
"And we wouldn't be able to figure out who else was in on her plan to nuke a perfectly nice section of the ruins of Europe so easily, either," says Bell.
"Moon," says Bell. "Public trial for her and her accomplices. I don't know if we can get her to admit to anything, and of course whatever vid I put out the smart people will know I could've magicked no matter what happened, but it'll go some way towards not making it just look like I'm picking on a rival for no reason."
"I suppose so," says Sherlock. "And in case of future unpleasantness, I think we should design a more comprehensive set of protections."
"I can't just be - physically invulnerable, or I won't be able to make coins in an emergency," Bell says, nibbling thoughtfully on her lip. "...Does Tony know what happened or did he just - you didn't tell him yet," she sees, looking.