Yorick invincible E ghoul bug.

Happened on ARAM a bit ago, the ghoul was immune to damage and healed me. It also did damage to turrets and would even stop entire waves by just being a small turret basically. Even if I died or did my E again it would STILL be alive.

I have never encountered this bug and it's one of the worst I have seen, would hate to see it on SR.

http://forums.na.leagueoflegends.com/board/showthread.php?t=2817068

Happened about 2 years ago from that thread, that person had it happen but with no LS and his own team able to attack, odd.