Cesare finds out about Leonardo's little rendez-vous with Ezio and imprisons the artist for good.

Ezio to the rescue.

Ezio to the rescue sees Borgia guards, bonus for the involvement of Micheletto Corella, tying Leonardo face down on a Spanish donkey (http://en.wikipedia.org/wiki/Wooden_horse) and having their ways with him.

Ezio loses it.