This episode has the perfect ending.
During a certain scene there are 4 Chekov's guns, aka 4 lines that pay off at the end literally and thematically via foreshadowing.
It takes at least two viewings and some skill at analyzing art to spot all four of these "guns." Once you recognize how every single line and even movement was selected as foreshadowing for the end, then you will appreciate this as one of if not the very best Firefly episode. There is a real reason this episode almost won a Hugo.
Unfortunately, most people today will not catch the well-hidden subtleties that Whedon and Minear injected into the script, and so this episode shall forever endure the tragedy of under-appreciation.