The core objective of an interrupt is to prevent a lethal or disruptive spell from completing its cast. The timeliness of interrupts is the key cast-prevention metric that defines whether a player achieves a successful stop or allows full spell completion damage. The difference is often measured in milliseconds: interrupting at the very end of a cast prevents the effect entirely, while reacting just slightly too late still consumes the interrupt but lets the damage or debuff go through.
Premature interrupts are one of the most common and costly mistakes. In coordinated DPS interrupt rotations, stopping a spell too early causes the enemy to immediately begin casting again, often before the interrupt cooldown is ready. This wastes the ability, disrupts the rotation, and creates unnecessary pressure on the group. The optimal approach is to delay the interrupt until the cast reaches roughly 90–99% completion, maximizing the cooldown recovery window and ensuring consistent successful stops.
This strategy relies on mastering the so-called “fudge window” — the final fraction of a second where the spell can still be interrupted but is extremely close to completion. Players must develop the discipline to wait, using visual or audio cues rather than reflexive reactions, and compensate for their own latency so the server registers the interrupt in time. Failing to do so results in the worst-case scenario: full spell completion damage, where the interrupt is consumed but the raid still suffers the full effect, often leading to a wipe.
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