I don't understand people complains about the fact that if you play "stealth" it is hard to kill bosses. Not really. If you play "stealth"... well continue doing it during the boss fight da... That is how I took out Barret: After cutscene throw flash grenade. It will give you time to get to the stash with shotgun and EMP grenade. After flash effect passes he doesn't know where you are and most likely will move to the corner where you stand in the beginning. After that I waited until he turned facing wall, through EMP granade and the red barrel which is in the centre of the room. Then he dropped 3 grandees under his own feet. Another EMP + 1-2 shotgun head shots and that was it. PS He never made a shot to my side...
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