[The Saucepan Man]

Originally Posted by Kuruharan

When he set up his ambush they had been in the Twenty-first Hall and the Chamber of Mazarbul for several hours, which is where the dwarves had set up shop. He probably didn't want them gettin' ideas.

Given their weak-kneed reaction (Ai! Ai! It's a Balrog. Mummy, I'm scared) when he did appear, he could probably rest assured knowing that any ideas that they might (hypothetically) have had would go straight out of the window with his arrival, and that they would just keep on running. So why bother carrying on the chase? Perhaps he wanted to hold the door open for them.

Originally Posted by Kuruharan

Actually, as the journey progressed its options were getting better and better with every step.

None of its options (with the exception of that clod, Boromir) were much, if at all, better than taking its chances with the Balrog. Fearsome though he was, he was defeated by a Maiar in man's clothing. And Balrogs in the first Age were defeated by Elves. Exemplary specimens of their race though they were, they were no Maiar. I doubt that he would hold too much fear for Sauron (of whom Gandalf was only the equal at full power), even with the Ring.

The Balrog was trespassing without permission under other people's property ...

Whoever gave the Dwarves the right of occupation? I don't recall mention of any Title Deeds ...

And who said that Dwarvish law is applicable? Balrogian legislation provides that possession is 100% of the law.