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.ShieldBlockEvent;

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

Name	Type	Has Getter	Has Setter
Name blockedDamage	Type float	Has Getter true	Has Setter true
Name damageSource	Type DamageSource	Has Getter true	Has Setter false
Name originalBlockedDamage	Type float	Has Getter true	Has Setter false
Name shieldTakesDamage	Type boolean	Has Getter true	Has Setter true