help with death knight quest

hi guys i was finishing the death knight quest line and got to the part of attack on light hope chapel, and for some reason the i was able to accept the quest, speak to the guy Darion Mograine and tell him im ready to attack, but nothings happens, they do not advance or spawn npcs nothing i waited for about 30 min, went to the chapel and nothing, so i went to google and someone said abandon quest and retake but now i dont see Darion, or any npc in that area, what can i do?!?!?

ty guys for any help