Sewer monsters aren't hostile to named Bandit Gangs

[Egon the Monkey]

Bandits with names like Greased-Hair Peerslicer are not hostile to the wildlife in the drips.
Possibly this is part of the Great Bandit/Spider Truce, or they all have levels in Druid. :P
But it felt odd to have invised, ran off, and not got to giggle as the Giant Spider and bandits beat each other up.
The Wildlife and Bandit Grunts/Veterans/Dweebs in the Common work fine, it just appears to be these two NPC factions of Named Gang and Wildlife.