Lisa was gone.
If he was brutally honest with himself, Ianto had suspected she was gone long before the team had killed her. From the moment the conversion had started, the cyber implants had been chipping away at her mind, her personality, everything that made her human. They’d gradually consumed Lisa, leaving behind only a shell inhabited by a soulless, emotionless mockery of the warm and wonderful woman he’d loved.
But he couldn’t let her go.
Instead of hating his colleagues, he should be thanking them for doing what he should have done months ago; they’d finally ended her suffering.