Quel'Delar quest bug pls solve!

I was doing whole day a freaking quest and when i came to sunwell it i did everything i putted item in sunwell i got restored Quel'delar and whats next
IT WONT BE PICKED UP..... I read that i have not to be in group i left group it still won't be picked up and instance kicked me out i came in again and i hadn't before needed item so im stucked and w8ting to get in my freaking bag MY SWORD WARMANE!!

I had the exact same problem few days ago.
Abandon the quest and get it again, make sure you're not in any group or raid, use the NPC that stays before portal to teleport you in, don't go there thru the portal on your own, throw the sword there and enjoy your sword ten minutes after doing so.