Heart and Mind Mission :(
That’s how it is for every mission in the game and how it used to be for dungeons/fractals.
Nope it’s that leader gets d/ced and then made us fail mission aka KICKED OUT OF INSTANCE SOON WE KILLED BOSS
Which happen in every other single story mission and used to happen in dungeons/fractals. Anet could make it so that the story instances are leaderless but there’s likely some technical limitations preventing that.
Actually that doesn’t happen with the latest episode(s?). There are additional checkpoints. The instances where you were teaching Aurene also had those.