Yeah I know I was hoping the scatter rules would get the job done... It didn't of course 
Do not throw metallic grenades, while you have the electro magnet for wiping the computers turned on.
Do not throw grenades if you are wearing gecko gloves.
Do not throw grenades into a 90MPH head wind.
Do not throw grenades at someone behind bullet proof glass
Do not throw grenades in a rubber walled room.