I'll be really disappointed if Arondir is really dead, but I suspect the showrunners know he's an important presence on the show.
I would have to go back and watch every episode this season again to be sure, but feels like the best, most solid, focused episode this season. I think it was really strong. I wanted to watch ep 8 as soon as I finished!
Kind of curious where all the Glanduin's water went. And I don't think a major riverbed is going to be that traversible immediately after damming it.
But man - Charles Edwards is dynamite in this episode.