This has no bug.
Note: Minify the command to avoid issues :)
Bence6's Super Enchanted Bow
Ghostly Horseman
Herobrine Shovel or Spade
Bence6's Super Enchanted Diamond Axe
Pet ENDER DRAGON!!!!!
Wither Storm Boss in ONE COMMAND
HEROBRINE COMMAND
HEROBRINE BOSS BATTLE (See YouTube for details)