Wild legendary engram

Yesterday I was on the moon going to kill some hive 500 to be precise. It was for this exotic bounty of which rewards you with this hand cannon called the thorn. Haven't heard of it? You have been in the dark for too long. Back to this engram I spawn jump on sparrow fly up the hill notice a kill patrol mission under bridge so I grab it. As I'm grabbing it the fallen is spawning out of cave to right the start shooting at me so I take aim with my thorn 2.0 (yes I have a few) I take them all out as there running up the hill. Then in slow motian a purple engram comes rolling down the hill to my feet. I just froze this was my 3rd wild engram since day 1. It was like seeing a the last dragon, or unicorn if you prefer. After the moment of shock wore off I picked it up was a chest piece. I finished my laps through hellmouth killing hive. The curiousity was killing me so I went back to tower. Decoded this wild engram aaaand I got *update* Rofl sorry to leave everyone hanging it a little bit of suspense in forums seemed fun. I just got "holdfast type 2" for titan same exact I bought from vanguard day of dlc release.