Q:

How do I kill the Treasure Goblin in Hell?

I've been playing through Hell mode on Diablo 3 for the better part of a day and have come across 3 Treasure Goblins. On all the lower difficulties you can either stun or disorientate him to cancel the portal. I've tried doing everything I can to stop him on Hell mode, though, and he still travels through. Is there a way, apart from blowing him up and killing him before he teleports, to stop Treasure Goblins from teleporting away?

A:

For information on Treasure Goblins, take a look at this previously asked question.
From my testing, there is no other way to effectively close the portal besides interrupting the cast and/or destroying the treasure goblin.  In Hell mode, all enemies have increased resistance and increased HP.  Therefore, you HAVE to output more DPS to prevent him from getting away.
From what I have noticed, once his portal is down, you have a set amount of time to kill him or make him run away from the portal before it doesn't matter: He will get into the portal and your loot is gone.
A few recommendations:

Try cornering him.  This will obviously try to prevent him from running away and allow you (and your team if applicable) to dump all of your DPS in a concentrated area.
If you have a mercenary or other teammate(s) with you, attack him from both sides - in attempt to not allow the treasure goblin from running away.
If you have not attacked the treasure goblin yet, DON'T ATTACK HIM UNTIL YOU CLEAR THE SURROUNDING AREA.  He will only run away once you start attacking him and if he, you, or any of your teammates aggro more enemies on the harder difficulties - it will get harder -practically exponentially per enemy - to take him down before he gets away.
Lastly, and obviously, make the treasure goblin your party's main priority [if applicable].  Notify everyone in your party that you see a treasure goblin and wait until everyone is ready to take him down (and the area surrounding him is clear).

