LotR1-FotR-Seq11

[Essex]

Boromir

Mistake 1- This is when he introduces the Balrog, and makes the goblins flee in terror. Why would they fear the Balrog, I thought it was he who commanded the Orcs as they drove out the dwarves?

From Tolkien himself as the Balrog arrives

The ranks of orcs had opened, and they crowded away, as if they themselves were afraid

Elladan

it's the same reason that the Witch-king didn't kill Gandalf in ROTK EE but instead flew off to "see who's blowing horns at this hour of the morning."

Jackson can't win then can he? He follows the book precisely at this point, and he still gets moaned at!!!!!!!!!! Jackson does not have the advantage of narration in his films (except in the prologue) so how can he explain Tolkien's description

But it was no orc-chieftain or brigand that led the assault upon Gondor. The darkness was breaking too soon, before the date that his Master had set for it: fortune had betrayed him for the moment, and the world had turned against him; victory was slipping from his grasp even as he stretched out his hand to seize it. But his arm was long. He was still in command, wielding great powers. King, Ringwraith, Lord of the Nazgûl, he had many weapons. He left the Gate and vanished.

He realised his attack was not going to plan - and had to refocus his attack before it was too late. The Wizard could wait - he had other eggs to fry.