I concur; not only was the fight scene amazing, but I've become highly invested in the characters, too. I don't generally get very worked up over fictional events, but the tremendous idiocy of the Farm Station leader had me raging at the screen. How can he be so stupid as to think that killing a peace keeping force of 300 won't bring the wrath of the entire coalition down on Skaikru? It's infuriating, and a TV show must be good if it can make you feel something.
Furthermore, this show has done a better job than I ever expected of advancing the plot each season in reasonable ways. Most high concept shows falter after a year or two when the writers run out of ideas, but the progression from the Ark to the Mountain to the Grounder capital has been well designed, and I can't wait to see what happens next (especially if it doesn't involve Jaha blathering about the City of Light!).
There was one thing I didn't understand, though: at the end of the previous episode, the Ice Queen was camped out somewhere with her forces, and at the start of this episode, she was in chains. How did she get captured? If she was with her army, did she purposefully give herself up so that she could orchestrate the events of the trial by combat? I felt like I missed a scene, there. One minute she's gloating over the destruction of Mount Weather, and the next she's a prisoner.