He’d tried to save her. He’d risked everything to get her help. He’d cried and begged but in the end she was still dead.
She had died of something he couldn’t control, something that he couldn’t stop and however he tried to forget that was what he remembered.
Torchwood changed him, patching over his pain not healing it but flooding him with so much shit there wasn’t time to remember.
The cyberwoman (nameless. impersonal. safe) caused memories of Canary Warf and the nightmares it had brought back.
Of all the things he remembered the memories of Katie were the worst.