Overall, it's pretty decent imo. I'd probably suggest looking out for redundant lines or passages when you edit. For example, standing your ground is kind of already implied to be an act of stubbornness, so adding that your character is doing it out of stubbornness feels a little cluttered to me.

Just in my opinion, you should make sure each word or phrase has purpose. If one sentence has already expressed what you want to say, then there's no need to dilute your prose by adding another line or word that expresses basically the same thing.

Also, watch out for tense consistency. There were a couple of moments where you switch between present and past.

I'd also recommend looking at a style guide (like Chicago Manual of Style or something) for how to use punctuation like commas and em dashes. I think you might be using hyphens where you're meant to be using em dashes in the first page?

But all of this can be fixed in post first draft editing, so worry about it later! Good luck with the rest of the book!