Distraction is the 2nd upgrade on path 2 for the Ninja Monkey. It costs $300 (Easy), $350 (Medium), $380 (Hard), and $420 on (Impoppable). Some bloons struck by the Ninja's weapons will become distracted and move the wrong way temporarily. However, do not count on this to stop bloons from making it through. It is only a nice additional bonus, not something to be relied on. The Summon Whirlwind and Tempest Tornado upgrades for the Monkey Apprentice are much more efficient and reliable at sending bloons back to the start.