In the Stark Tower level, during your second encounter with the chopper, use the sniper rifle to pick off the first couple of snipers. An armored yakuza will come out of the doorway and try to kill you. Kill the yakuza and stand directly next to the doorway that he came out of. Wait for another to emerge and grab him before he can shoot you. Interogate him, then quick kill. Rinse, repeat. Watch as the points (and bodies) pile up! If you stand right next to the door and pounce as soon as the doors open you will not get shot, and no matter how many you kill, they will keep coming. And don't worry about the chopper, the snipers cant hit you where you are standing.