I don't think you are understanding that 18 second statement correctly. There is no retroactive increase or decrease in damage if you later root the mob or cause it to flee or if root breaks. The patch is explaining that the increase in duration (extra ticks) of the dots offsets the reduction if you let it move for 3 ticks or less. They built in some room for root breaks while still providing the same amount of damage/mana as before.
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DoT spells have all had their duration slightly increased. If the monster moves for 18 seconds during a fight, it will take as much damage from the DoT as it would before the patch. If the monster moves for less then 18 seconds during a fight, your DoT will do more damage then it would have done before the patch. If the monster moves more then 18 seconds during the fight, it will take less damage then it would have before the patch.
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Quick example with generic numbers.
Tick = 6 second window, 3 ticks = 18 seconds.
Pre Sep 1999 - Dot mob with 10 tick, 10 dmg/tick. Mob takes 10x10 = 100 damage over 10 ticks whether it is rooted, stationary, running, or fleeing.
Post Sep 1999 - Dot mob with 11 tick (bonus tick increase from patch), 10 dmg/tick. If moving the dot is only 0.66 (66%) effective.
If stationary/rooted the entire time = 11x10 = 110 damage.
If moving at the moment 3 ticks occur = 8x10 + 3x10x0.66 = 80 + 19.8 (20) = 100 damage.
If moving at the moment 4 ticks occur = 7x10 + 4x10x0.66 = 70 + 26.4 = 96 damage.
If moving the entire duration = 0x10 + 11x10x0.66 = 0 + 72.6 (73) = 73 damage.