For some reason, I didn't talk to Callista before the mission and I didn't get the sub-quest at all! I think it's because I went the other way to the boat, using Blink and such, and not the way game wanted to force me to go... So the question is, if I even save him by swapping the glasses and then tranquilizing Campbell, will the game register it as saving Geoff? Will Callista be grateful? Will I miss the achievement, still?

Is there any other way to trigger the quest if I didn't talk to Callista? No notes I found nor no conversations I overheard triggered it...

But then again I might have choked / tranquilized someone too early or didn't pick up some note, but I AM VERY METICULOUS person so the very fact that I somehow missed a convo with Callista is BEYOND SHOCKING, especially when I inspect every nook and cranny...

If I screwed up on this one, I'll hate this game forever.

What are the consequences / benefits of saving him? Does it affect ending in any way?

Anyway, is it possible to save him without even having it as a quest, and then Callista acting as if he was alive???

If I ensure he'd run away free or dump his sleeping body in a dumpster next to Samuel's boat, would the game register this achievement and in consequence, would he be present in Hounds Pit Pub?

I would hate to replay the whole mission again, because I did everything, every other side-quest, I searched through every nook and cranny, collected every rune and bone charm, found every secret room, etc. ...