I happened across it a couple days ago..... I figured he despawned because I ran out of the court. So I grabbed a couple buddies and we tried like 6 times to kill him but couldn't figure anything out without him being immune or despawning.
That being said I think he is the white knight you see talking to Oryx in one or two of the cut scenes.
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No, he's one of Crota's followers that Oryx keeps around for laughs. The white knight from the cutscene you fight during the exotic sword quest