The quest Premature Explosionation is a problem. Flying closer to the Power Keg seems to fix it.
Code:
<If Condition="((HasQuest(27141))[Fly][N - Quest] Uldum 83-85 [Kick] - Alpha && (!IsQuestCompleted(27141)))" >
<CustomBehavior File="FlyTo" X="-8952.063" Y="-1551.263" Z="94.45328" />
<CustomBehavior File="ForcedDismount" />
<CustomBehavior File="InteractWith" QuestId="27141" ObjectType="Gameobject" MobId="205241" NumOfTimes="1" CollectionDistance="50" X="-8947.323" Y="-1544.188" Z="94.4532" />
<CustomBehavior File="WaitTimer" WaitTime="45000"/>
</If>