Have you fallen and can’t get up? Let your buddy give you a hand—save those defibs for later.
As in the campaign, you can use a defibrillator to revive yourself. However, you only have two defibrillator charges, as indicated by the gray lightning bolt icons below your name at the top of the screen. Instead of defibrillating yourself, it’s much better to have your teammate revive you. You can revive a downed teammate by standing over the body and holding down the use button—this is a context-sensitive command whenever you’re close to an incapacitated teammate. You must hold down the button for a few seconds while staying within a few feet of your teammate. This can make you vulnerable to attacks by enemies, so make sure the area is clear before attempting a revive. There is no limit to how many times you can revive a teammate, so make this your team’s preferred tactic for getting back into the action. Save those defibrillator charges for the most dire of situations when both you and your teammate are down at the same time. If both players are incapacitated at the same time and you each have no defibrillator charges left, the mission ends in failure, requiring you to restart from the beginning.