What everyone has missed with the castle reference isnt the act or the definition of castling. Nor is it the act itself.

What’s missing is ‘why’ one would castle.

2 possibilities

the first is as an emergency escape hatch due to being put maneuvered.

The second is due to deliberate planning, sucking the enemy into a trap and then turning the enemy attack against them as a set up to a counter attack.

Anons, I believe the storm is imminent, if not arrived.