Must include Telam's story here, as he is found in the Davoust's Betrayal scene in Clarissa's Story.
Davoust accompanies a clean up team sent to the cave system based on Clarissa's directions. She finds the water elemental, as it wanted, and merges with it. This happens after Clarissa's debrief but before the Infusion scene.
Davoust follows the addictive effects of Infusion clinically through herself and the Sweep Team.
Davoust and the Pool were not aware of each other until Davoust visits the section of tunnels Clarissa reported. The Census Office and City Watch use Clarissa's intel to smash the Servants, who thought all of their people were killed in the botched tralaticon deal.
Davoust's lab starts clean and straight, but eventually German expressionism (see Caligari) takes over - darkness, hard angles, etc. as she falls.
Davoust is so certain with regards to pure tralaticon and infusion that she volunteers to test it on herself first.