The characters have discovered what the Big Bad is up to. They have no hope of stopping him, but if only the Reasonable Authority Figure knew... There is no Epic Hail handy. They have to go in person to Bring News Back of what is happening, along a long, difficult, dangerous route. Odds are good that they will be chased. (Bottled Heroic Resolve may be required to keep going.) Other reasons to Bring News Back include disaster about to strike; disaster averted, and news must be Brought Back so that the people at home don't activate the fallback plan; discovery of a traitor; et cetera.