Lets say if your 2 teammates die. You can wait the 30 seconds and revive them. But lets say if there is a lot of enemies by them, just got invisible! You could save the fireteam for that! I know this wouldnt make sense to people that say Hunters are useless in PoE...
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I don't run bladedancer in PoE even though it's a better choice to help out teammates but I like to run gunslinger so I can be a orb factory for my teammates