[quote=@HereComesTheSnow]
you should see my dorm
[/quote]

i have three people in a room meant for two and none of us into cleaning regularly

[quote=@Lucius Cypher]
You'd still have to consider the frantic conditions, even taking account a normal persons night vision. Much harder to do find obstacles and hostile when the hostile are in flux and the obstacles are the least of your worries. 

I suggest spraying and praying, or failing that flailing wildly.
[/quote]

Except moving enemies makes things easier. There's nothing frantic about what the humans in that room are doing, the only chaos is coming from the movements of Grimm.

Moving enemies, especially when you know where your allies are in relation to you, makes discerning targets even easier than discerning obstacles. Telling one target from another becomes trickier when you have a large group, but frankly there's no need to tell them apart. Seeing a moving hostile in low light conditions is easy. A shotgun in its direction is even easier.

Human night vision evolved in large part so we could deal with the things that go bump in the night.