They might have left because the blights didn't activate the mission, so there was no need for them to complete it. And while I don't condone leaving matches early, if that is the reason then I don't blame them as it's the usual bungle issue adding things in broken.
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That I could get, but its five minutes of their time wasted versus twenty minutes of mine. If it were me i wouldve at least stuck around to finish it so they could get their loot.