It's not a matter of keeping up when your douche of a fireteam member runs through everything, including the Darkness Zones, to wait at the door of the final boss.
Getting killed in the process, withholding.
English
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We wait because there is no point in killing things that aren't important faster strikes = more rewards
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TL;DR Quit rushing ahead if you're going to die
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i rarely die while running ahead and if you don;t want progress reset on bounty l2keepup