Direct answer
Objectives follow journal display order. Some depend on your choices; follow the active objective in the game.
Result
One day, while traversing Toussaint's charming wilderness, Geralt ran into two men desperately calling for help. As they told it, their brother had remained in the cave they had just hastily left. Nothing out of the ordinary, I suppose, if not for the fact that inside this sibling had been attacked by beasts. Geralt decided he would try to help the man.
