The Hidden Blade Assassin's Creed in Depth

So I was replaying the Sequence 3 mission "Double Agent". The one where you have to save the young thief before he's shot at by arrows. Well, La Volpe says he will take care of them, but leaves you to deal with everyone. If you stay where you're at (the roof), you notice that he doesn't move. He just stands there!!!

I found that you can press and he will drop to the ground, causing Ezio to pick him up. I tried looting his limp body, but he doesn't give anything up.