Those two piranhas at the bottom of the first big drop do not seem to have any z-axis movement ability: they are stuck in the pit. They will path through the wall (aggroing friends) and eventually warp to your location. When killing for experience at the zone entrance, I would always lull/bypass those two mobs and grab the other sharks from that first lower room, which path up that vertical chimney pretty well.
I agree with Rhal, the zone is great--a nice change of pace!
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