I'm not saying it's an apt choice of words by any means.
'There is no other extenuating conversation going on in the room, compared to other cases that I have worked on,' remembers Ciaccio. 'In all my years of doing autopsies and everything, this was probably one of the most solemn I was ever a part of.'
I'm reading this, more or less, like: "There is no attempt to
extenuate (through chit-chat) what we were doing: we're cutting up corpses (of celebrities we're fond of).
Good to know: Some student forums use the term extraneous circumstances, but for official forms, you’ll need “extenuating” or “mitigating.”
This one triggered my curiosity a tad, and I googled "mitigating conversation", but then I narrowed the search down to
books.
Here's what I found:
…and…
First one is from the
Handbook of Research on Medical Interpreting, by possibly non-natives Souza, Izabel E.T. de V. and Fragkou, Effrossyni (Effie); second one, though, is from a book called
Purgatory by British author Paul David Adkin (whom I'm not familiar with).
My point being: yes, I perfectly understand that the collocation "extenuating conversation" is nothing short of weird, and I'm not confident enough to reach a verdict on whether "mitigating", "alleviating" or something else along those lines would be the more natural adjective, but I
do get the point. And
extraneous is in my eyes just too generic. Of course the talk is gonna be irrelevant if it's meant to extenuate the mood (which, by the way, I take to be the –implicit– object). But the point is to describe the purpose of the conceived conversation, not its content.