Balrog Breaking and Entering

[Mnemosyne]

Don't forget also about all the crazy cataclysmic stuff that was going on during the War of Wrath. Could the shaking up of the earth that must have happened with the drowning of Beleriand been enough to 1). catch the Dwarves off guard, 2). open up new and secret ways under the earth, or 3). possibly even trap the Balrog there? (Sorry, but I have a bit of a hard time thinking that the Balrog spent that much time just waiting very, very patiently for Dwarf fricasee...)