The mole overplays his hand — forging a spy report to frame Bobbie — and is quietly, ruinously fired by the boss who saw through him.
Spooked after Bobbie Draper caught him passing the memory stick, Soren Cottwald tries to get ahead of exposure by fabricating an intelligence dossier that brands Bobbie a deep-cover Martian agent, "Amanda Telelé," and pressing Avasarala to have her arrested for a "full intelligence debriefing." He plays the loyal aide who took initiative to spare his boss embarrassment, angling for a bonus. But a single nervous tell — biting the inside of his lip — undoes him: Avasarala realizes the report is a fake, and that he is Errinwright's planted mole who has been filtering her data for months, enabling Nguyen's secret fleet. She plays along, thanks him, sends him for tea, then delivers his ruin with terrifying calm — the men he serves have no tolerance for failure and will discard him now that he's slipped, and neither does she: "Don't leave anything personal at your desk." She watches the future he'd built for himself collapse into a life on basic support.
It isn't enough justice for the deaths his lies may have caused, but it's all she can manage on short notice.
A stiff, rail-thin young European man in office attire, drenched in cologne; his practiced charm curdling to a greenish anxiety as his career dissolves, hands steady even as his eyes betray panic.
Errinwright's exposed mole, fired and ruined after trying to frame Bobbie to cover his espionage.