How to Revive
Multiplayer matches in Uncharted 4: A Thief’s End can prove to be pretty hectic. As you and your team run, climb, jump, and swing about the large maps, you’ll have to deal with some deadly opponents trying to shoot you down. Having a teammate dropped during an intense firefight can often spell disaster for your team, luckily Uncharted 4 included a revive mechanic for multiplayer.
When one of your buddies gets downed mid-match, you can race over and start to revive them by holding down the Triangle button on your DualShock 4 controller. Even if they start to move away, as long as you started the revive, it will still work.
Alternatively, if you happen to have a RevivePak, you can throw it at them and watch them rise from the ashes from a much safer distance.