Vieri De Pazzi Stunt Assassination
I didn't see similiar videos, so i think i'm the first that had this idea 
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http://www.youtube.com/watch?v=tp1-x2kHRmg
Video Informations:
1- Get on the top of target's tower and kill all guards, then go to the underlying surface and drop Vieri out of the building using the grab method showed in the video (you can also hit him one time with knifes and then grab and push him out).
2- You will see that he come back into the city walls and after few seconds you will return anonymous. Now you can air-assassinate him 
Not bad at all! What happens when you do the waterdrop transition? Did you just wait for the mercenaries and the guards to kill each other? I'm glad you decided to make videos, Altair92, well done.
(the sound hurts my ears though)
What system are you playing on, PS3, 360, or PC?
"When you have to kill a man, it costs nothing to be polite."- Winston Churchhill
"Kill a man, and you are an assassin. Kill millions of men, and you are a conqueror. Kill everyone, and you
i waited that Vieri came back to the gate of the city, it take 2-3 minutes so i decided to skip it 
. I'm playing with xbox 360, the video/sound quality aren't that good because i'm using a camera to record it... i suggest you to decrease the sound volume xD