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[Despite any cold or what have you, Jaffar it out practicing. He would go to the barracks for it, but that would be too out of the way if Nino needed any help. Though, outside of their community building, Jaffar has set up a training dummy that he stole borrowed from the barracks itself. What is he practicing?
Well, his critical secret killing technique. You can see it
here (it's the second attack, not the first) but to explain it in words- Jaffar, facing the dummy, spins his daggers in his hands, then slides under them after a quick feint, and then without losing nay movement leaps up. In that leap on dagger hits the target in the back. Anyone overly familiar with anatomy would know the point in the back he hits is precisely a point on the spinal cord sufficient to give some full-body paralysis. The other dagger then hits the dummy's throat, and if it were a real person it would sever their carotid artery.
Basically, a superior killing technique.
The beauty of this attack though is how fast Jaffar is and how fluid his movements are. The whole thing, though it requires a lot of complicated movements, is over in less than a few seconds. What's more, at no point in the attack does he stop moving. Even after making his two stabs he almost immediately hops back to the position he started from.
Rinse and repeat.
Feel free to react-]