Advancing a mainquest generally spawns the corresponding next main quest step and a side quest. The latter by definition are often not very related to the main one. Is this one particularly so?
Usually the 2 different ways to solve a main quest step spawn entirely different side quests, so those will be unrelated from each other, like the two here were.
Did you read the cards, by chance? It's absurdly unrelated.
Spoiler (click to reveal)
It introduces characters in a way that you feel you should know them. It literally feels like a card out of a different scenario.