Your going through the tower to see ada-1 or someone something and you see SHIN MALPHUR THE HUNTER THE LEGEND just firing shots in the air telling drifter to harden the -blam!- up and come out of his hiding hole
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Sounded like shin was going the other way and becoming not so crazy. Personally think the drifter “was” justified at a point for all the dredgen stuff. He saw the dark ages, what warlords and bad guardians can do. He left because he saw how messed up earth was and looks out for himself. I think the lady efrideet destroying his bar is more foreshadowing about guardians screwing him. Also Shaxx and Cayde are/were dredgens