I just did this last night, and it took me five tries as a level 38 Lancer, because my Highlander Gladiator companion died so quickly. I figured he should, given his class and race, have had some sort of survivability, but apparently not. I've solo'd every single scenario quest thus far, and this is the only fight I've had trouble with - and it's not even the mobs, it was just keeping my companion alive.

I only fought 3 mobs - 2 Lancers and an Augur. I went in with Provoke and Taunt equipped, and kept all the mobs off my Companion, but the Augur's spells still managed to kill him. I ended up winning by Provoke/Taunting the two Lancers, hitting Heavy Trammel and Leg Sweep early on to keep them focused on me, and killing the Augur as quickly as humanly possible. That seemed to be the key to it; even if all the mobs are focused on you, the Augur's spells are AoE and will still hit your Path Companion. Also, I managed a lucky stoneskin cast on my Companion right before the Amalj'aa fight started, which helped him survive the first AoE spell.

On an only somewhat related note, I crashed right after the "You have failed." message popped up but before I exited the instance, and logged back in.. to a completely empty and un-exitable Bowl of Embers. I had to Teleport to Camp Broken Water to get out again. As if I hadn't been frustrated enough. >: