From Dead Island Wiki

Stomp is a skill that can be learned via the Combat tree for any hero in Dead Island. Stomp allows the player to kill any fallen zombie with one attack, provided the player doesn't move, isn't interrupted, or the target doesn't move out of range of the attach in the casting time. The player just has to approach an fallen zombie, stop, target their head, and press the Kick button. An upgrade for Stomp can be found as the highest skill on the Combat tree, which allows the player to perform the skill without having to stop moving.

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