That's a connection issue with you and your fireteam. More than likely, one fireteam member had a terrible connection. All PVE activity is via peer to peer connections like pvp.
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Edited by Mando12000: 12/5/2016 2:16:10 AMI thought it could be that because everyone had a green bar except one but his was yellow and it's never lagged that bad with one yellow bar.