Billy is just looking out for his Fireteam LMAO
[spoiler] To be honest and fair when I posted this, I did not know until after I posted that someone had already found this Video and shared it. [/spoiler]
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I was thinking it was going to be spirit bloom, then billy would go to tell his fireteam, and by the time they arrived the chest would be despawned. I guess that's vault of glass though.