Ras,
They're kinda touchy

I've found they work best as long as they're being kept on a regular spawn timer, by folks doing the quest. It seemed if they single-popped, the mobs would not be lootable.
I tended to hang in the back of that cave section, away from the titan. Throw a shield, they'd all come running. Obviously not going to work for you as ret.
_________________
"What's the kill order?"
"This room, the next room, the hallway, and then the boss."
*throws shield*
