Okay I went ahead and checked and I what I mentioned above happens around chapter 189-191 in the novel.
He actually does something like that much earlier (spoiler), should happen in a few chapters. But what he becomes aware now is important for the chapters you mentioned, that is correct.
Spoiler .....................................................................................................................................................................................................................................................
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He runs into Dane's burning house, the other firefighters won't enter, to save Darling.
OH YEAH THAT TOO LOL I FORGOT ABOUT IT-
Wait as fellow novel readers
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Isnt it the best when he takes dane to disneyland one last time and breaks up with him i cried
that was peak bro i bawled my eyes out
That was my favorite scene of the novel tbh. You really felt both Grayson's and Dane's heartbreak.
This chapter is significant to the story despite the random ass explosion because we see Grayson not ever feeling like he can walk into a fire to save someone's life. But later on in the story Grayson runs into a burning building on the brink of collapsing to save Dane even though the odds at the time were tipped towards neither making it out alive but he does it anyway for love. (Also note : I read the novel so long ago that my memory is hazy and what I've said isn't exactly 100% so don't quote me on it.)