From b90a8671d89d40f9d99598465225b1efdfc43d63 Mon Sep 17 00:00:00 2001
From: drXor <mcyoungsota@gmail.com>
Date: Tue, 25 Feb 2014 15:15:26 -0400
Subject: [PATCH] Cancellable WitherSkull potion effect


diff --git a/src/main/java/net/minecraft/server/EntityWitherSkull.java b/src/main/java/net/minecraft/server/EntityWitherSkull.java
index a4df9a1..b809e1b 100644
--- a/src/main/java/net/minecraft/server/EntityWitherSkull.java
+++ b/src/main/java/net/minecraft/server/EntityWitherSkull.java
@@ -35,8 +35,11 @@ public class EntityWitherSkull extends EntityFireball {
     protected void a(MovingObjectPosition movingobjectposition) {
         if (!this.world.isStatic) {
             if (movingobjectposition.entity != null) {
+                // Spigot start
+                boolean didDamage = false;         	
                 if (this.shooter != null) {
-                    if (movingobjectposition.entity.damageEntity(DamageSource.mobAttack(this.shooter), 8.0F)) {
+                    didDamage = movingobjectposition.entity.damageEntity(DamageSource.mobAttack(this.shooter), 8.0F);
+                    if (didDamage) {
                         if (!movingobjectposition.entity.isAlive()) {
                             this.shooter.heal(5.0F, org.bukkit.event.entity.EntityRegainHealthEvent.RegainReason.WITHER); // CraftBukkit
                         } else {
@@ -44,10 +47,11 @@ public class EntityWitherSkull extends EntityFireball {
                         }
                     }
                 } else {
-                    movingobjectposition.entity.damageEntity(DamageSource.MAGIC, 5.0F);
+                    didDamage = movingobjectposition.entity.damageEntity(DamageSource.MAGIC, 5.0F);
                 }
 
-                if (movingobjectposition.entity instanceof EntityLiving) {
+                if (didDamage && movingobjectposition.entity instanceof EntityLiving) {
+                // Spigot end
                     byte b0 = 0;
 
                     if (this.world.getDifficulty() == EnumDifficulty.NORMAL) {
-- 
2.1.0