Chapter 9:
I've always wondered at the trees stirring when Lucy speaks. It is simply that they're sleepily responding to something outside of themselves? Like someone shifting positions when prodded, but not at all awake? Is it Lucy herself speaking to them, like her address is an echo of the horn-blow or a precursor to Aslan's roar? Or is it that they sense Aslan's presence, but dimly (given that they'll be dancing when he's in their midst)?
As someone who's recently experienced what it's like to paddle for a few hours, I can now sympathize with three pairs of tired arms. It was exhausting, and my arms were absolutely miserable that evening (and would have been still the next day, but I've got a remedy for that).
I'd forgotten to mention it before when the kids were on their way to Cair Paravel, but am remembering now that they've got messy pockets: were their schoolclothes were carefully mended before they returned to England, or were they magically restored?
"Wouldn't it be fair to believe her this time?" What's interesting about this is that it seems like everything in Edmund is saying to go down, but for that one niggling reminder about what happened with the wardrobe. That's a measure of faith at work, even though he didn't otherwise act on it.
Chapter 10:
Aslan's reproaches are done in a familiar way here. He doesn't answer Lucy's questions... because she
knows the answers. Our consciences and the closeness of our walk with the Lord will result in similar sorts of admonishments, where we don't physically hear them, but we know them to be true all the same.
Edmund's curious mix of his own thoughts and his faith come through again: "I do wish you wouldn't keep on seeing things. But I suppose we'll have to wake the others." Even as he discredits her witness, he's willing to take the chance that maybe she's right after all.
Chapter 11:
Now that Edmund is more awake, he's in a little better frame of mind. And unlike the day before, he is willing to put his money where his mouth is -- that is, to go the direction Lucy says Aslan is.
Peter, on the other hand, is warming up, but still reluctant. Almost Thomas-like, relying more on the sight of his eyes than in the report of a sighting of Aslan.
This whole chapter is one of awakening. Starting with the literal waking from slumber of our heroes, then the spiritual wakening that allowed them to see Aslan, then of Old Narnia and of anyone within earshot of that powerful roar.
As for the Romp... I'll just drop a poem I wrote earlier this year (fanfiction.net is not affiliated with TLC; click at your own risk):
https://www.fanfiction.net/s/13962501/8/By-Their-Fruits
(It does combine this chapter and a later chapter and is not chronological, but it’s more about the theme than the events.)
Chapter 12:
"The help will come. It may be even now at the door." Always loved the irony of this moment.
"Best of badgers."

I agree wholeheartedly with this pronouncement. His steadfastness, shown all the clearer in this chapter because he is faced with more than one dissenting voice and flanked by others were are feeling discouraged, is truly beautiful.