8th ring event question? Did I screw up or is it a bug?

[SNIPERS]

Tonight I went to complete my 8th ring. I invised to chief inside the fort and killed him within 3 minutes of his spawn. As I went to invis out to hand garadain the head in exchange for the ring, I noticed that he solo walked past the orcs in the entrance and engaged the kromrif's inside the fort. This was 4 minutes within the time chief spawned. I also noticed that there was no army of dwarves on the hill and that all of the entrance orcs have been untouched.

This was my second time completing the quest and and i've never seen Garadain engage so quickly let alone, by himself. I also found it odd that the orcs did not aggro him and he had free entrance to engage the kromrif's inside. Unless someone tampered with my quest (which i find hard to believe), I want to know if this is some kind of bug?

I essentially am left with a chief head in my inventory and apparently I can't even piggy back off someone else's quest because Garadain despawns after he gives you the ring. I'm certain i did not do anything correctly and did not waste time, so I want to know if there's anything I can do besides wait for my petition to get answered or if i'm simply screwed (which I hope I'm not) because it took me over 4 months to finally win a ring roll.

Any information is appreciated.