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It may blind a shooter, but it blinds everyone else too.
https://www.msn.com/en-us/news/technology/miami-professor-develops-index-card-sized-tool-to-deter-mass-shooters/ar-AA1eVA9b?ocid=msedgntp&cvid=db98239e260c4c27bf7f4b5444b19237&ei=40
I could also think that a shooter may just start randomly shooting, which is what they do a lot of times anyway.
Depends on how the light is cast.
If it's not bleeding back on you, you can see fine.
