The Grand Goblin will move around the arena, first of all.
Do not attempt to attack the boss, while attempting to avoid his attacks.
This will stun it temporarily.
The next step should be obvious to you.
you gotta Buddy-Up, i.e.
The rest of the battle with the Goblin is identical.
Avoid its attacks and wait for it to stun itself.
Only after that, deal damage while working in team.
All told, you better attack three times, in this way.
Finally, you are going to take part in an eventful scene connected with the large falling platform.
After several moments, this stage will end.
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