Stunt Assassination on Dante Moro and Eagle Stike on Silvio Barbarigo
http://www.youtube.com/watch?v=6vMENPQAGbI
Dante and Silvio start running from you once you cross the threshold to l'Arsenale. So don't. Go over the walls instead, and you'll find your targets as (mostly) unresponsive puppets.
Dante can't be grabbed when he's at full health, but there are other ways to move him - gentle pushing, tackling, bumping, etc. I find that attempting to grab him as the fastest and most precise way to move him - He steps directly backward when he blocks your grab. Also, Dante can be grabbed if you injure him first, with a throwing knife, for example.
Silvio is easily moved. You can grab and throw him to move him around quickly. I move him to a tower just outside of l'Arsenale. I toss him past the threshold of l'Arsenale, and then I climb back over the wall to continue moving him on the other side. This is necessary because he will start fleeing toward the ship if you cross the threshold to l'Arsenale in either direction.
Here are some related videos:
http://www.youtube.com/watch?v=P_CAGjaXk40#t=6m57s
http://www.youtube.com/watch?v=A7Nces5P3rw
*Applauds*
Great work, Ian. I always climb over the wall for these two since you first showed me how that works. Much easier. But it's good to see that you can have a bit of fun with the targets before dispatching them. 
I'll definitely try teasing them a bit first the next time I play!
Heh heh heh, a turkey shoot eagle strike. That was bound to happen sooner or later. I was actually wondering if those targets would stand still forever and wouldn't react to you at all. And you did that all within a time limit, great job! 
Gamertag:THBmemberAurel
Bartolomeo: "What do you mean?"
Ezio: ...
Bartolomeo: "Why?"
thx. i originally wanted to move both of them outside for a double eagle strike, but i couldnt move them into position within the time limit. dante in particular is difficult to move past the threshold.
i dont know why i didnt think about this earlier... you can grab and throw dante if he is injured. i'll have the double eagle strike video soon.
very nice Ian i would have never thought of moving "The Fat one" to do an eagle stirke i like it =)
dante has the scariest scream when he dies...
Guess what? CHICKEN BUTT