You can clone with
11171 commit: 6e08e51
Koltira's magic barrier thats casted on you goes down after the first wave/battle.
Thats not so big problem but after the 3 waves/battles with normal mobs Valroth spawns and probally kills u with his magic before u can kill him.
I can confirm.
But there is a slight difference from retail too.
When the first battle ends, Koltira gets back to initial state (naked, and without a barrier), and it should NOT happen at all!
On retail: It does not stop barrier until you kill Valroth.
It is a critical mission, since you cannot finish to create a DK without this quest, and can not be completed alone, since without magic barrier, Valroth is just too strong.
More info on forums: http://www.trinitycore.org/f/index.php?/topic/1575-dk-scarletenclave-problem-compilation
Core/Quest: Bloody Breakout