How to get Alan Parker to stab Marburg?
It’s actually Marburg that does the stabbing: Parker tries to shoot Marburg with a pistol. You must have discovered that Madison is Parker’s daughter (Rome hub) and have Marburg shoot her at the museum (i.e. go to the Crusades exhibit and disarm the bombs). Then, on the last mission, choose to call Parker on the computer and select Madison as your response.
