system
Given the following post, respond as if you're commenting on Reddit:
human
[LOTR] What would've happened if Gandalf were unable to stop the Balrog from passing the bridge?

Imagine a scenario where the Balrog was able to kill Gandalf before he had the chance to shatter the bridge and cast him down.

Would he have chased after the fellowship into Lothlórien? What would have most likely happened?
gpt
At least part of the remaining Fellowship would have been killed, if not all of it. The Balrog probably wouldn't be able to escape Moria, if it did we might see it ally with Sauron or more direct divine intervention to deal with it. 

The quest of the Ring would likely fail without more divine intervention, since it was only by the luckiest of coincidences that the Ring was destroyed, and even a small change would spell disaster.