Regarding the removal of Nightfall mod. They never said there will be a checkpoint... it just says that there will be a 30sec delay and you will be back in the game... am I correct? That would mean the beginning of the game... The activity can no longer be called a Nightfall if the Nightfall mod is gone... think about it!
Edit 1: You guys are right the delay is for revives only. I still think there will not be any checkpoints. Regardless if there will no longer be a WHS.
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They want the nightfall to be easier than a heroic strike but without matchmaking, so you can do it with just 1 other friend for the rewards. Since the community says rewards should be more obtainable.