How is Bastok 9-2?
Duo-able?

Probably - make sure to skip the cutscene going into phase 2 as fast as you can or you'll get eaten by the adds that spawn in this phase. Can always watch it again later on youtube or something

My findings:

Retail:
You get a CS and Zeid summons 2 shadows at 70% hp.
Volker joins the fight at this point.
Adds are unsleepable.
Adds have very low HP and will be resummoned if killed.
Zeid favors AoE sleep weaponskill
Cant lose xp in the BC

Nasomi:
You have to bring Zeid down to 0% to trigger the CS and Volker spawning.
Adds will spawn in after about 3-5 mins -does not appear to be linked to a hp threshold.
(I actually think adds are already spawned and it just took them some time to run to the BC area)
Adds semi-share hate with Zeid in the sense that they will auto link.
Adds appear to be carbon copies of zeid in HP, defense, attacks, spells, etc.
Adds are sleepable via lullaby. 0 resists on a well geared brd.
Neither Zeid nor adds will aggro Volker.
Volker never moves.
Whoever adds have hate on pre-CS, they will continue to attack during the CS.
Will lose xp in the BC upon death

I died in the BC dual boxing as thf and brd because the adds unslept just as i auto-attacked Zeid down to 0 on phase 1.
This caused them to beat my taru brd into the ground as i spammed enter to get through the CS.
I let both chars die, got kicked from the BC, homepointed, and it counted as a win