So... that's it? Mae started a fire and everyone died? And that guy actually killed himself over it? Wha?
Why would the fire kill everybody? I've been in a fire, there were exploding windows and everything! In fact, the exploding window was what woke me up. And nobody died! And I don't even have the Force!
No, this was Osha's point of view. Notice that while she is not directly present for the entire episode, all of the major events center around her. Even her interactions with Mae are from her perspective, with several gaps in Mae's timeline within the episode, most prominently in the climax.
There are still questions to be had here, however. What was Sol doing at the Fortress? There are certainly innocent explanations. But there are also sinister ones. What really killed the Coven? There were no flames, nor smoke present in the room with their bodies, and Sol conveniently prevented Osha from examining any of them in their haste. Why did Mae try to kill Osha with fire, but then seemingly want to save her later in the reactor(?) room? On the one hand we have two, on the other we have two, but somehow everything is coming out five and it just doesn't add up.
Not going to be at all surprised to circle back around to this for the Jedi POV at some point. Because this is clearly the point at which everything goes to hell, and that doesn't yet make sense.
Also, not sure it will be relevant to the mystery plot, but am I the only one who noticed just how quickly Sol became dangerously attached to Osha? I have questions. We'll see if the show has answers when all is said and done.
And, finally, some wild tin foil hat time theory crafting! Mother Aniseya "created" the twins, while the other sister carried them. But the Jedi would be shocked/appalled/terrified if they learned the truth of how they were created. I don't think this is going to be an Anakin "the Force made them" kind of thing. I think it's going to be a Darth Sidious got himself an apprentice from the Nightsisters kind of things. The Coven did a deal with the Sith in order to avoid extinction. The twins are the result.
The Sith always intended to return to claim at least one of the girls, which is why Mother Aniseya was so quick to try and induct them into the Coven. It may even by why the Coven is seemingly in hiding in the first place. Holding out on the Sith and not holding up their end of the bargain. But the Jedi found them first, which forced the Sith to act to cover up their tracks. Hell, it may even be how the Sith found them in the first place. The Sith Lord killed the Coven, and the Jedi encountered him/her/it but failed to stop them. I also suspect that Sol and the other three Jedi learned the truth of Osha's origins, at least in so far as being tied to some dark side plot if not tying it to the Sith directly, and this will be why they have lied to her this entire time. As well as explaining why the Jedi as a whole remain oblivious to the Sith game, as the four Jedi agreed to cover it up and never reported their existence in an effort to protect Osha. Much as they buried the fact that Mae was a twin, which now seems likely to have been hidden for the same reason.
This will backfire later in the story, when Osha learns the truth and Mae dies. Resulting in Osha going full dark, killing Sol, becoming the titular acolyte and taking her place in the Sith order. (Unless Sol is revealed to have been the Sith all along, which I still think is unlikely but cannot rule out entirely at this stage.)