Npc's and statics. Sombra creates some nifty combat scenes modding the system. But it's a pain (as been mentioned in conversation) because sometimes npc patrols don't really put themselves for that great angle shot.
So it's not even real. Should've guessed. Looks too good.
Wish NPCs could play an actual role like that on the server. Even as decoration as long as it gives the illusion of a fight being bigger than it is.