chapter 13 boss not dying?

[Mateus_GameX]

I'm with this problem, and i cant solve lowering the resolution and disabling the V sinc, Can u help me?

[Toms200]

I have custom build PC now and have no problems at all now. 

Windows x64 Windows 10 Pro
Mother borad - Gigabyte GA-Z87X-OC Force
RAM - HyperX Savage 16 GB (2 x 8 GB) 2400 MHz DDR3 CL11 DIMM XMP Memory Module
CPU - Intel 1150 i3-4330 Core i3 Box Dual-Core Haswell CPU (3.50GHz, 4MB Cache, 54W, Socket 1150)
CPU Cooler - Be Quiet BK019 - Be Quiet! Dark Rock Pro 3 CPU Cooler
PSU - Corsair CP-9020056-UK RM Series RM850 80 Plus Gold 850W ATX/EPS Fully Modular Power Supply Unit
Video Card - Gigabyte AMD R9 270 OC 2GB 256-Bit DDR5 WF2 PCI-E Graphics Card

[kasmil2]

thamks it working for me

[WhatD4DogDoing]

Is this still happening? I'm at chapter 3 or 4 but I'm curious if this is still a problem.