Cortana: "We made it through jsut before the portal closed. I'll drop a beacon, but we're pretty far out. Could be years before someone finds us." (No, not an exact quote but yes this is what she says.)

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When cities burn and armies turn and flee in disarray,
Cowards will cry "tis best to fly and fight another day."
But warriors know it, in their marrow when they die and fall:
It is better to have fought and lost then ne'er have fought at all.