Walking represents living, and usually means living according to the true things taught to us by the Lord -- to "walk in His ways." When the Lord is pictured walking, it means life itself.

In Isaiah 34:8; 63:4, the day of vengeance signifies a state of damnation; also the Last Judgment. (Apocalypse Explained 413[6, 7])

'Day of vengeance' signifies a state of damnation.

(References: Arcana Coelestia 488)