Marcus laughs for what feels like the first time in years and tears spring to his eyes, but the laugh is genuine. It's real. He's in so much pain, but he looks at Kat with such tenderness in that moment and manages to smile.

"I know, duck," he says. "I'm so lucky I have you."

It isn't a goodbye, Marcus refuses to do anything remotely like that, but there are things he needs to say while he has the chance. Even now he can feel the demon trying to regain control and he knows he doesn't have much time left. With his teeth clenched, Marcus manages to hold on for just a little while longer. Long enough to meet Kat's eyes and keep smiling.