I was in the cosmodro me waiting for wolves to show up. While waiting I decided to do some patrol missions. One was for enemies and I knew a lvl 8 reaver vandal spawned there. Ran up there, shot the shank. Shotgun need the Vandal, turned around to kill more enemies, something smashes into my back. I turn round to see this Vandal unloading on me with barely any health gone. I figured I must have only clipped him so I did it again. And again. Before realising g he would not die. Fight lasted 5 minutes. 5 minutes of pain later I Nighthawked him and he went down. Wolves had come and despawned by the time I'd finished. I think Bungie should make him a constant thing and rename him Randall.