Full: For 4...9 seconds, all allies within earshot gain 5...13Health per second while moving and move 33% faster. "Fall Back!" ends on an ally affected by this shout when that ally successfully hits with an attack.
Concise: (4...9 seconds.) Allies in earshot gain 5...13Health per second while moving and move 33% faster. Ends for an ally if that ally hits with an attack.
Combine with "Incoming!" to give your party a maintainable 33% speed boost.
Heroes tend to stack "Fall Back!" with all other IMS shouts.
Anomaly! Contrary to the description, affected allies are healed every second, instead of gaining health. This is relevant for skills that modify healing effects.