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19 days agoYou are little bit misguided on point 2.
This link has a ton of information and photos.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5514183/
Fragmentation grenades are designed to throw shrapnel in “all” directions. A majority of them will be up from the point of the floor however there are plenty of fragments that will still be thrown laterally across the floor.
That being said you would have a higher chance of survivability laying on the floor behind something.
This link has a ton of information and photos.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5514183/