How to fix prestige nightfall: After you've done the ghost scan with the exploding shanks. Have one person stay where you deployed your ghost. Another gets on their sparrow and rides out to where the map changes and the pulses should be. They then turn around and head back till the map changes again. Now when you head back out again the pulses should be there. Worked for us anyway, we are only a 2 man fire team tho trying to find the quickest way there. I'd also suggest you guys skip all the first anomalys and rush there, once through have 2 people go deal with the walker and clear towards the boss while the other glitches the anomaly in the shank room for time.