The one who played GTA V must remember the mission "massacre" when playing for Trevor. The script adds 4 mission plan, scattered across the desert. To start the job, meet two communicating people and stand up to the handle. After a brief mental conversation instantly grab a Kalashnikov rifle (or whatever you have) and soak your all in a row. Enemies appear literally everywhere, so spin 360 degrees head on and look for shelter. However, there are also subsidiary factors: for each killed enemy you have improved body armor and the butchery takes 1.5-2 minutes.