It takes a special kind of petty to put aside the hellish circumstances you’re in to make sure a despicable person gets what’s coming to them, and while I probably wouldn’t have put a pickax through Juno’s leg given all that was going on, she did manage to settle a score and secure her escape, depending on which ending you watch.
Sarah Carter is about as helpless as all the other humans in The Descent, but she has a pretty damn good run in the end.
She is successfully able to kill a good deal of Crawlers, but the ultimate killer move is the one against her former friend Juno at the end.