One of the most immersive experiences in this game for me is the blizzards that happen occasionally. I was carrying all blue items trying to get to the extraction point but that blizzard had me running into enemies from already being chased after enemies, I couldnt see anything.
Example of a blizzard from older video
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Also, when you are in a building exiting to outside and the sun is in your face, you get a glare that works to your disadvantage.
Cool stuff.