Those threads are messed up enough that I would not trust them with 800'ish psi on them anymore. Running a die over them will remove metal where it was pushed out of place. THis will still leave the damaged area even less able to hold up against the load. 850 psi is not a pressure to be taken lightly and you've only got 4 to maybe 5 good threads still holding the connection together. That's not a lot of safety in my books.
I'd suggest that unless you can find some way to replace that end spool that runs through the block that you're better off just chalking this one up to experience and forget about it.
I had a "Paintball God" moment once.
Like Al Bundy's Polk High football moment I live on
for the slim chance of repeating that one time
miracle in some small way.........