They'll just kick you earlier before the option is locked. This wouldn't solve much, but it's a nice thought.
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This would actively prevent people from getting kicked right as the boss dies, or right as it becomes obvious that this run would be a success, which would deny them the activity completion rewards even though they helped with the completion. Being kicked before starting the encounter would hurt far less, because you don't know that you'd have finished the activity.
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True, I stand corrected