I don't know when Bungie changed this and who's dumb idea it was, but before (all these years) "invisible" Hunters were at least a little bit visible. Now they seem to be 100% invisible.
This should not be a case in an online fps pvp.
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They arent difficult to spot most of the time but they shpuld get nerfed either way. Invis is a major benefit in pvp. I dont understand why Bungie hasn't done anything yet....