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Close I guess, but the crucial detail will have to be previously unmentioned or not even alluded to. I could give an example but it'd contain spoilers i guess
Sounds like Suddenly Always Knew That
Seems like a plain, old Chekhov's Gun. Bring up the knitting ability, and then it comes into play later.
I'm on the internet. My arguments are invalid.It was Schrödinger's Gun! Thanks a lot @Meta Four and everyone for the suggestions.
Edited by Sahl
So I'm not sure if this is about Chekhov's gunman or gun or arsenal or whatever. This trope was about an author's ability to create/bring-up details to fit the current story-line or event, like explaining that a character was knitting before so that he is no stranger to embroidery for whatever plot related reason.
- The answer was Schrödinger's Gun, thanks everyone.
Edited by Sahl