Tavi moves left while Kern's rune emitter turns to follow him. The narrow guide ray is only a warning. Kern fixes the angle, brightens the cue, and fires a wide beam along that exact line. Tavi changes course after the lock and clears the beam with ordinary movement. The source does not turn during damage or snap back between loops.
Tavi moves left; Kern's emitter and thin warning ray turn toward Tavi's current position. The thin ray does not damage.
Autoplay is disabled by reduced-motion settings. Scrub to compare tracking, lock, and beam.
Set an emitter pivot and turn speed, expose the tracking cue, choose a lock instant, and test full-body clearance before the beam becomes dangerous.
Place a readable pivot on the boss, not an unexplained line from screen space. Aim its guide ray at the player's current position with a bounded angular speed; keep the boss's full body unrotated.
Use a distinct lock flash or sound, store the final emitter angle, and hold it through the startup and active beam. The thin guide ray is a warning, not a hidden hitbox.
After lock, allow enough time for ordinary movement to leave the beam half-width plus the full player radius. Test near, far, slow, and direction-reversal starts; then leave a useful recovery.
A beam that quietly turns after the lock invalidates the announced lane. If a later sweeping phase is intended, signal it as a separate rule and test its moving hitbox.
When a faint tracking guide damages on contact, the visual language contradicts the rule. Distinguish warning from the wide active beam with thickness, brightness, and timing, not color alone.
A center point outside the line can still overlap a thick beam. Include the player's collision radius and test the worst lock angle near arena edges.
Expose emitter position, maximum turn speed, guide length, lock time, beam half-width, and active duration as tuning parameters. Avoid instantaneous correction to a sudden player turn.
Tracking changes the source angle before commitment; firing uses the stored angle. This differs from a homing projectile, a sweeping active beam, and a marker that simply locks a location.
Measure perpendicular distance from the complete player body to the committed beam segment. The lock-to-fire window must cover that distance at a plausible movement speed, with a little margin for perception.
Kern's rune eye visibly follows Tavi, then hardens into a fixed stone firing channel. Tavi wins space by reacting to the commitment, not by guessing where an invisible weapon points.
Ordinary movement is the baseline escape. A dash can widen the margin, while a guard may offer an alternate response; neither should be required unless its availability is guaranteed and clearly taught.
Source tracking moves the emitter before release. Target lock marks a location, predictive aiming leads observed velocity, and scanning beam changes its direction while already active. This example holds its angle once locked.
The robot's head uses a thin tracer that targets the player before expanding into a wide laser. Its visible source and growing width make the aim-to-danger transition legible; Kern's isolated demo adds an explicit fixed-angle lock.
The head eye charges before its Phantasmal Deathray; the target's side determines the sweep's starting angle and direction. This is a useful contrast: the source-based aim is readable, but its active ray sweeps, unlike Kern's fixed beam.
The STRIDER's large Eye gives its long-range laser an unmistakable physical source. Movement and cover shape the approach to that source; Kern's diagram removes the terrain and isolates tracking, commitment, and beam clearance.
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