Balrog getting killed?

[Manwe Sulimo]

Suddenly Gandalf laughed. 'But what would they say in song? Those that looked up from afar thought that the mountain was crowned with storm. Thunder they heard, and lightening, they said, smote upon Celebdil, and leaped back broken into tongues of flame. Is not that enough? A great smoke rose about us, vapour and steam. Ice fell like rain. I threw down my enemy, and he fell from the high place and broke the mountain-side where he smote it in his ruin.'

The lightening, at least, was accurate.