In this cut the warlock appears to shoot a blue ball (not purple) into the air. Is it another power?
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Nah it's the nova bomb
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possibly but keeping in mind that bungie says they are still in pre alpha stage means they could have just changed the color of the nova bomb from purple to blue or since it was dark in the wall of old russia that could have influenced the coloring of the nova bomb.
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Update: the video doesn't get cut just go to 6:23