Orbs act in much the save way instanced ammo works. It stays in the ground until you wipe, which doesn't happen in PvP.
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My orbs disappear when I die, not when I (or we) wipe. Every death, every single death, orbs all gone. Use my resurrect on warlock? Orbs gone when I resurrect. Orbs, all gone. Perhaps I have a bug?
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You don't ever see the orbs that you generate, only the ones your teammates do. Whenever you generate orbs, other players see them drop off of you and even after they die, they can pick them up.
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I mean, the orbs that [i]other people[/i] generate for [b]me[/b] disappear on death, and if this happened in PvP, then you couldnt fill up on orbs after you had died. See what I mean?