"To the River" has 8 progress tokens on it. There is no active location. Legolas participates in an attack that kills the Hill Troll. Does quest advancement happen before of after I'm allowed to use Legolas's response?
If before: To the River increases to 10 progress tokens, then advancement, then Anduin Passage stays at 0 progress.
If after: To the River stays at 8 progress tokens, then advancement, then Legolas adds 2 progress tokens to Anduin Passage.
Does the rulebook support either scenario?