|Lets start this session on Rundown, game mode equals Free-For-All. In Modern Warfare the Pain Killer perc comes in handy when your rusty with the controller. The pain killer perc allows you to have a health boost if you have a death streak of 3 or more, not to be confused with a kill streak which is when your the one doing the killing. Another point of advice can come from watching the kill cam and learning what your competitors are exploiting to get the drop on you. Following these steps should allow you to get back in the game.