This is a stretch, but in this pic you can see swords mounted on these structures around the room. This is reminiscent to the covenant crates that held misc weapons. They just seem very.... pick-up-able. Heck that hive knight seems to have the same one. Ill try to capture a better pic here soon if possible.
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Here's another picture. Not sure if we'll be able to pick them up since our guns will be "our swords" but they look pretty cool nonetheless.
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I see, OP. Interesting...