level 24, get crazy, throw those bomb cluster without waiting for them to hit, just be sure you know the right angle of hitting it, the vibration of those bomb will cause the whore to get killed at the bottom by falling ceiling
and yeah, on the last part, when i reached bout 80 hit left, there is an instance where i dont have to move the mouse anymore, they hit the same spot over and over again
true grenade dart launcher is the best, go on the 2nd floor on the right where ammo get respawned, and wait for enemy to respawned to on the right, its a ! hit kill, though its boring..... you can survive the whole round.....