It's possible for Desmond to assassinate Dr. Vidic during the closing credits. After Lucy says, "You need to stop him." don't engage the Templar thugs (Lucy is a big girl and can fend for herself. ) Instead, follow the route to the loading dock as shown in the video. Get between Vidic and the truck and insert Desmond's brand new Hidden Blade in his back. FLAE will probably want to rough him up a bit first.
Now go back and help Lucy clean up. The game continues with Vidic resurrected in the back of the truck. Dante Moro would be proud.