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 was doing that in the nightfall, at the end we made the mistake of going in the room early so we got -blam!-ed. I had a warlock(31) a titan (31) and then me as a hinter(29) I had to go invis and revive my teammates so much just because the shanks and for that I got etheric light ;) [spoiler]I main a lv 32 warlock btw[/spoiler]