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Because of the inherent server delay and the deployment time of units, playing purely 'reactively' means your defense will always be a fraction of a second too late.

Predictive gameplay looks like pure magic to a casual observer; it appears as though the player is reading the opponent's mind and dropping spells on empty tiles.
Exploiting Habits
90% of players will place their defensive building on the exact same tile every single time they defend that specific push.

When you launch your final Hog Rider, you don't wait to see the Cannon; you instantly cast a predictive Fireball on the exact tile they have used all game.
Drop your win condition and instantly roll a log to clear the swarm you know is coming.Count their rotation.Prediction is a high-risk gamble. Knowing When They Will Strike
Prediction is not just about guessing where a card will be placed; it is also about predicting exactly WHEN the opponent will launch an attack.

If they just over-committed 9 elixir on a failed push, you can predict that they will be completely unable to defend a sudden Bridge Spam attack in the opposite lane.
The GambitExecutionRisk AssessmentThe Predictive Spell (e.g. If you liked this article and you simply would like to receive more info with regards to tower rush generously visit the web page. , Log, Fireball)Casting a spell on an empty tile where you know the opponent's counter will be placedOnly in double elixir or when you are absolutely certain of their rotation; incredibly high riskThe Predictive Defense (e.g., Pre-planting)Placing a defensive building early because you know they are about to attackWhen they reach 10 elixir and their win condition is in hand; moderate risk The Grandmaster Move
When you successfully pull off a massive, game-winning prediction, it is the most satisfying feeling in the entire game.

Observe the patterns, trust your math, and strike before they even know they are vulnerable.