This was a particularly gratifying chapter for two reasons.
First, I finally understand that Ecthelion's fatalism is a result of religious beliefs. That revealation was very helpful in looking back and understanding his actions, both the inexplicable (wanting to destroy the bridge) and despicable ("I am obviously graced so my depravity must be, too").
Second, I was getting impatient in the first half with Thorongil being such a...well, dork. I assume that this is part of his character development, but it felt like he was a little too fumbling before, considering his life experiences up to that point. Now I'm happy to see that he is learning to play politics as an actor rather than as a pawn.
Finally, a grammatical issue: "You are wrong about the Orc. They have already chosen..." - the "they" refers to the Powers, not the Orc, right? Maybe change to "The Powers have already chosen"?