If you get the chance, watch the rotoscope cartoon Tower from 2016.
It’s super intense and really gives you a sense of what it’d be like to be in a situation where a gunman starts shooting at random people in the streets.
I usually sit with my phone while watching movies, occasionally turning it on during boring parts. Halfway through this movie I had completely forgotten I ever owned a phone. It really grabs you. I kept having to wipe away tears, both because of the horrible stuff (no gore) but also because people did so much to help each other.
And it does what everybody always say we should do with mass shooters; it doesn’t glorify him. It doesn’t even show his face. It’s all about the people he harmed.
It really stays with you but not in a bad way, so I wholeheartedly recommend it.