To say that he wasn't expecting the attack would be a massive understatement. It sort of answers the question of who's lying, but it's not the answer Andrew was hoping for.

"James!" he chokes out, though it's still the Master he's looking at, now with a wide-eyed, betrayed expression. His hands come up to grip the Master's forearms, trying to pull the knife away from his throat, feeling it press against the skin as his adam's apple bobs. He doesn't struggle or squirm, all too aware of the blade.