ISP:
Charter

Type of Internet Connection:
DSL

Internet Connection Speed:
4mbs+

Date & Time:
September 2nd, ~3:00-4:30 CST

Frequency:
Always, at least the 3 times I tried it

Character Name:
Alxa Vrinn (though it affected everyone in the party)

Race:
Race of your character when the issue occurred.
F, Hyur

World:
Sagittarius

Class/Level:
SCH/50

Area and Coordinates:
Coerthas Central Hightlands X 32, Y6

Party or Solo:
party - 8 players, tried it with different subset of players the 3rd time to same effect.

NPC Name:
None

Monster Name:
D'horme Chimera

In-Game Time:
11:30 a.m - 3:08 p.m. though likely over course of more then one day, this was 2 hours+

Steps:
Detailed steps on how the issue occurred.
While doing the instanced battle the D'horme Chimera uses all of his attacks but never performs a voice of the ram or voice of the dragon, once we kill him he disappears but the quest does not advance and we do not leave the instance until the time has expired.

Tried this three times, same exact results.