Throwable Impact Event 
To use this event use the following import:
groovy
import net.minecraftforge.event.entity.ThrowableImpactEventSub-Classes 
This event extends the following events and can use all their methods and fields: 
EntityEvent
Methods 
groovy
net.minecraft.entity.projectile.EntityThrowable getEntityThrowable()groovy
net.minecraft.util.math.RayTraceResult getRayTraceResult()