Mar
Mar asked James Bow:

This question contains spoilers… (view spoiler)

James Bow Mar, thanks for your question, and my apologies for my delay in writing back (Goodreads don't notify me when I receive questions).

Note, anybody reading this, that spoilers follow.

Simon definitely means Aaron in this context. He suspects that Nathaniel killed Isaac, and has some evidence to that effect. However, he SAW Nathaniel kill Aaron directly (the bloody knife on top of the anchor), so that may have brought that up in Simon's accusation earlier.

He has a lot to say, and not much time to say it in, I think. Does that help?

Edited to add: further to my point, I'd refer you to the early part of the first chapter, bottom of page 2 and top of 3 where Simon says, "...because when I remember it, it still feels like my fault." That may be another reason why Isaac didn't come up top of his mind when he accused Nathaniel.

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