I can’t tell you how many times I’ve watched Puzzle Rings wasted in Public games. Players get one and want to “share” the treasure by cubing it ASAP in a Bounty or Rift run for others to enjoy.
This has been tested by me many, many times. Greed will run into walls and drop a goblin six (6) times before he stops dropping them. Each goblin dropped can be killed with the resultant drop of loot.
If you kill Greed before he drops goblins you lose out on one of the better treasures in the game. It’s like running into a crowd of goblins in an enclosed space with the bonus of Greed at the end.
This is how to play it. Try it on your own a few times to get the hang of it. Dismiss your follower and any pets, ancients, etc. so they don’t cause damage to Greed too soon. Enter the vault and wake him up. Find a wall to hug well away from him and wait for him to come to you. Dodge all the crap he throws at you but lure him into running into a wall.
As soon as he hits a wall he’ll drop a goblin. Position to kill the goblin WITHOUT injuring Greed. When he’s dropped 6 goblins you can finally kill him.
LOTS OF LOOT!! Have fun!