A couple of things: 1.) Why is the life steal so much higher on the first pic than the trade pic? 2.) If it is legit, it's probably a world drop. I really doubt someone had characters with declining levels by 10 tagging a mob. Not saying that doesn't work it just seems more likely someone got it while leveling and its a super super fucking rare world drop. Wowhead only shows drop sources from people that are running the wowhead addon so it's entirely possible it's just never shown up. It doesn't seem locked as an "instance only" drop (ie drops from the silithus zone). They probably messed it up when they launched BfA and it drops from all zones now. Wouldn't be the first time lol.