The event is not cancelable.

The event does not have a result.

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

ZenScript
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import crafttweaker.forge.api.event.entity.living.target.LivingChangeTargetEvent;

LivingChangeTargetEvent extends LivingEvent. That means all methods available in LivingEvent are also available in LivingChangeTargetEvent

Name	Type	Has Getter	Has Setter
Name newTarget	Type LivingEntity	Has Getter true	Has Setter true
Name originalTarget	Type LivingEntity	Has Getter true	Has Setter false
Name targetType	Type ILivingTargetType	Has Getter true	Has Setter false