This system of prioritization is known as 'aggro' (aggression), and mastering it is the most critical mechanical skill in the game.

This article will dissect the mathematics of sightlines, retargeting, and unit hitboxes to help you manipulate the AI flawlessly.
The Concept of Sight Range
Every single unit in the game possesses a hidden 'sight range' value, usually measured in invisible tiles.

Understanding exactly how many tiles a unit can 'see' allows you to place distractions at the absolute maximum possible distance.
Memorize specific tile locations.You must use a stun spell (like Zap) to force it to rescan.Flying units often have different pathing rules. The Geometry of Defense
One of the most complex aspects of aggro management involves understanding the physical size, or 'hitbox', of different units.

The physical mass of the tank will actually push the Miner backward, forcing him to lose range on the tower and retarget onto the tank.
Unit CategoryTargeting StyleSiege TargetersCompletely ignore all enemy troops, making them incredibly easy to kite across the entire map with cheap structuresFast AttackersOften have dash abilities that lock onto targets from far away; must be intercepted before the dash animation begins Drilling the Mechanics
Reading about aggro ranges is completely different from actually executing pixel-perfect placements in the heat of a live match.

Once you internalize the invisible grid that governs the AI, the game slows down dramatically.

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