I imagine it comes in waves. And even if one wave just pushes someone to the point that buys ammo, the next has to push it only to load the gun, and the final o

I imagine it comes in waves. And even if one wave just pushes someone to the point that buys ammo, the next has to push it only to load the gun, and the final one just has to push it to pull the trigger a little harder. :/ Though I have no data about this.