"It was mostly just an accident."
I've mentioned before the lack of attention given to the female characters and who they are and where they came from. We got origin-type material for Ezra and Kanan and, even, Zeb fairly early on, but, until now, there's been very little background provided about Sabine or Hera. Not that there's a lot in this episode, but it's something.
So what do we know now?
Sabine used to be a bounty hunter.
I don't know; she seems a little young to have used to have been a bounty hunter, but I suppose that explains the Mandalorian armor.
She used to have a partner. And they... split up, not on the best of terms.
Which, of course, makes their reunion less than pleasant.
I wish I could say that there was some kind of moral dilemma in all of this -- I'm going to be spoilery here -- some kind of dealing with past emotional trauma or... something..., but there's not. The Empire conveniently shows up and puts the two "friends" back together again. In some ways, it's a "Han Solo scenario," but it doesn't quite go that far.
It's a fine episode. Lots of action. But it's another reminder that Rebels fails to tackle the difficult questions.