Oh, man. I had to go away and collect my thoughts before I could hope to muster a cogent comment on this.
First, thank you, dear grace, for giving Red this idea. It all makes so much sense. Josef refuses calls all the time. And Mick knows how to fight vamps, even as a human - he proved that with Lance and his cohort. Mick would have a chance against Anders and his crew. Except for the gun.

(Thank you for begging her to get Josef to do it, too... 'cause we
needed him to.)
And oh, Red, what a beautiful story you wrote. Beautiful, and complex, and full of all the layers that make Moonlight work so well. Hurt and blame and anger and resentment, yes. Terror and despair and a wrenching reminder of other losses, other life-or-death scenes. But most of all, love.
You started off with a bang, and a mystery. I didn't know who was hurt, and who was watching. And when I found that it was Mick, I really began to panic! I read it frantically,
needing to find out what Josef would decide. Weak with relief when he made that hard choice to try to bring Mick back. I swear I didn't breathe till the last few words... and then I had to go off and compose myself, because it just doesn't
do to cry at the office...
I could quote the whole story, but this part so perfectly captures the quandary Josef and Beth face, and the relationships among the three players:
"You don't know what you're asking."
"Yes, I do. And if he hates me for forever, at least he'll be alive."
"There are worse things than death."
"You don't really believe that."
A sad shake of his head, "No. But Mick does."
I loved Josef's anger in this story,
and his sense of responsibility. (Who does he call first? The Cleaner, of course. Damage control is so much more than personal.) And you've so beautifully captured Josef's feelings about Beth: his anger and blame, his dismissal of her feelings for Mick as shallow hero-worship. Even though Josef knew well that Mick loved Beth, he had no reason to believe that Beth was worthy of that love. Not until his vamp senses told him what he needed to know.
I was OK, really OK, till this line:
That’s what Mick felt as the first bullet shattered his breastbone – he'd never felt more alive.
For Josef to take Mick's humanity away without his expressly stated permission... that is huge.
HUGE.
To me, though, hard as it is, there really is only one decision. Because Beth's right: Josef really
doesn't believe that there are worse things than death. Life means possibility. And I think Josef needs Mick in the world.