Full: For 3...10 seconds, target foe's attacks do +10 damage, but there is a 50% chance that the damage from each attack will be done to that foe instead. (Maximum 10...50 damage.)
Concise: (3...10 seconds.) Target foe's attacks do +10 damage. Each attack has a 50% chance that the damage (maximum 10...50) will be done to that foe instead.