system
Given the following post, respond as if you're commenting on Reddit:
human
[Lord Of The Rings] Did Gandalf really need to hold the Balrog at the bridge?

The bridge seemed quite narrow and it looks like by the time the Balrog crossed it the fellowship would have escaped. If Gandalf didn't hold the Balrog there, would it have really continued chasing them all the way out of the mountain?

How far would it have chased them?
gpt
I think they fought for a week non stop? So the Balrog eventually would’ve caught the fellowship when they got tired. If Gandalf would’ve made his stand there he would’ve revealed himself too soon and the scale of the fight might well have hurt or killed some of the fellowship. 

If Gandalf expected a better battleground he might have waited but as it was he couldn’t risk it.