system
Given the following post, respond as if you're commenting on Reddit:
human
[LOTR] So did the Balrog accidentally cut the stone bridge with his fire whip or did Gandalf smote it?

I'm watching the movie and arguing this point with a friend. The book clearly says that Gandalf does it but the movie plays the scene totally differently. Gandalf looks surprised by the whole thing. Is the Balrog an idiot or what?
gpt
He does it in the movie as well. It was just delayed; the bridge only collapses when the Balrog stepped on it, having been weakened by Gandalf.

Gandalf shows no surprise at this until the Balrog's whip snags him  'round the ankle.