I'm on CC's side as to the commas, and on yours, Parson, as to TDZ's single sentence paragraphs, which for me render the piece too staccato. I agree with CC again, though, as to the need for a separate line for the sentence "At location three..." as without it, you've lost all the impact it should have given the story.
I have to confess to not understanding this on first read -- not helped by the dense main para. I didn't understand the FTL battle tactics which rather left me cold (each to her own!) so as far as I was concerned they added word count without adding information or drama, and although I've heard of Casper the ghost I know nothing of him, so I couldn't understand how he could be a FTL warning system, nor indeed what one of those would be. Mainly, though, I didn't feel it was within my very narrow understanding of New Weird as a genre -- it was SF with a ghost, which is odd, but not weird, if that makes sense.
Being pernickity, not only were the missing commas and italics a problem, but the inconsistent use of numbers ("5" as a numeral but "three" not) was annoying, as was to my Brit eyes "salable" (which I've since discovered is a variant -- US only? -- of the more usual "saleable" so sorry!) and there should have been a hyphen in "jump-capable" (which might have given you another word if I'd thought about it when you checked FTL -- sorry again
). There's a tension here for those of us working with close POV, since the first para is from Chorrup's POV, and you put the ---- line across to show a change to Marie's, but of course the "At location three" line can't be from Chorrup's since he's just been nuked. If the whole is omniscient the ---- line is otiose. And further pernickitiness, why is Marie telling Casper what he already knows ie "you are our only"?!
Anyway, overall, I didn't think it lacked a middle, since you've set it up and you have a punchline, nor do I think lack of words was a problem, as to me it didn't require more.
As everyone else is re-writing it, here's my version
***
Chorrrup sneered at the hospital ship – the tub was a cornucopia of saleable booty, and no match for his jump-capable
Widowmaker. He was five light hours out. To stay unobserved as he disabled
Newhope, he'd fire from five downtime locations starting at five light minutes out.
At location three
Widowmaker was destroyed by an FTL missile.
Captain Marie of the
Newhope smiled. “Thanks for keeping watch, Casper. You're the best ever FTL warning system!”
***
Starting with a name and action is often more impactful, by the way, hence my pushing the "five light hours out" to later on, though it cost an extra word; "overflowing" to me was a bit meh as an adjective
so I've gone way over the top with "cornucopia" again bringing an extra word, and I've added a few more in the last line to make it clear who Marie is. But the deletions I've made keep it at 75 even allowing for "jump-capable" being two words.
Not sure if any of that's a help!