[He should have expected she'd ask a probing question, and for a moment, she catches him up short. Dissembling isn't an option: she's seen the climax of the Arklay Mansion Incident as he'd lived it. And like the Doctor, she deserves transparency. The question remains, how shall she react? Will it sever whatever this is which he feels forming within his heart?]

He was a colleague who'd suspected what I was and the things I was hiding. That creature which slew me was the Tyrant I'd helped to create. Enrico saw through my scrim of affability and marked me as one of the creature's creators. I couldn't allow him to compromise my persona. And so I killed him.

[He falls silent, bowing his head slightly, bracing for anything, including the snuffing of the small flame in his heart.]