Johnny Vindicator Can Kill the Creaking

When you spawn a creaking by a Johnny Vindicator, the Vindicator will kill the Creaking. But Creaking can't kill by a Mob or an Iron Axe.

1. Spawn a Creaking (I use Spawn Egg to Spawn it).
2. Spawn a Johnny Vindicator.
3. Sometimes the Vindicator kill it.

(I can't speak English very well, maybe there's some grammers wrong. )