In previous games, when I chased a thief across the rooftops with no weapon but my fists equipped, I could sprint after him with RT (playing on Xbox 360) and when I got close enough, B would turn into Tackle. That enabled me to tackle the thief and take my money back (or re-steal whoever's money he'd already stolen) without killing him. It seems I don't have the Tackle option in Revelations. So is there a way for me to get the thief without killing him?
I tried just beating him up once I managed to catch up to him, but since thieves always run around on precarious rooftops, I punched him off a roof by accident and he died anyway.