Getting hit by ricochets be they bullet or jacket fragments is just an exercise in probability. Shoot enough at flat, hard, or even not flat, and softish targets - ie a variety of backstops, you'll eventually get tagged, and repeatedly so. When shooting/training is your job, and you do it every single day, be it indoor or outdoors, you start becoming pretty desensitized to it. The only one that I ever took great note of was the jacket from an SS109 round that hit me (part of it anyway) and stuck in the back of my neck - I was over 75 meters away from the firing line, well behind it, and walking toward the parking lot at the range in question. Very odd angle and spot, but as I said, when you shoot every day for years, you realize just how common it is, especially with steel plates as targets, and steel backstops indoors, even if designed and installed properly.
Just glad it didn't hit you in the eye without protection on. The first range I worked at while putting myself through school had in one week a suicide, a robbery, and a customer lose most of his vision in his eye due to a ricochet indoors on the 50m rifle range due to not wearing eye gear of any kind.
When I worked for Sig Sauer Academy, it was the first range/company to really mess a lot with the frangible ammunition. Ammo like that which is designed specifically for shooting at flat/hard surfaces, even indoors, still throws a lot of fragments, small though they may be, all over the place. The idea being they are too small to cause any issues, and it's typically the case. Not always though.
