It is my understanding that, when one selects a zero-action branch in an opportunity card, one is essentially redirected to another card. Sometimes one is then capable of clicking "Perhaps not" without losing access to that second card, which has replaced the first in one’s hand; I have mostly experienced this in special areas like the Flash Lay, but it also happens in London with the Implausible Penance card. When I select a branch of "An implausible penance" and then I back out, I have a new card in my hand with a different image from that of the Implausible Penance card, and indeed a different image from that used in the Implausible Penance’s branch I have just selected. Subsequently I am able to handle this card as I might any other: whenever I please I can discard it or select it and proceed with my desired action.
My question is why this doesn’t happen more often. It doesn’t work with cards such as "A visit" and "Wolfstack in the fog", where clicking on a branch and then "Perhaps not" will remove the card from my hand. It’s been a while since I conducted the relevant experiments and it’s hard for me to remember specific examples now, but unless something has changed recently, I’m certain most "sub-cards" of this kind will auto-discard upon clicking "Perhaps not". Which is disappointing, because when I realised the implications of this August 2015 blog post (as I understood them through the Flash Lay example) I thought all cards of this type would work like that. Apparently not.
PS: At least I have a fresh example now, "A kindness of ravens". The branch "Take your raven to the weasel-fights" leads to another event (and gives the impression that it will move you to another area, but actually doesn’t). Is that actually a card or a storylet? I don’t know, but once you back out it’s gone.
edited by The Duke of Waltham on 6/2/2016