I've noticed this bug for a while now it works for all 3 Artifacts you get (1 for each of the Classes) If you have an artifact that grants orbs of light on grenade kills when it procs (dropping an orb of light.) You can pickup your own orb of light.
There will be a link to a youtube Vid proving the bug.
In the video no one around me is generating an orb of light other than me (You will see me back up after getting my grenade kill and the orb still falling)
I have also seen an artifact bug with the Hunter Artifact Efrideet Eye (Unknown if its just this artifact or not)....It will have for the Perk rolls Int and Str; and for the addition perk choice Int and STR but the one that says Int gives Str and vice versa. Sadly I don't have a pick showing this bug (accidentally deleted the rare artifact).
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Edited by Kain: 11/24/2015 1:20:04 PMYour buddy that tethered was hopping around everywhere... He just happened to be close enough at one point for one of the orbs he generated to pop out and roll right next to you. You didn't generate any orbs, just look at the game feed, it was all the other guy.