When I noticed that the wind had closed the book I was (and continue to be) filled with a mixture of holy awe and fear.
Several years ago there was a brisk wind at the Easter vigil which, for the first and only time I can recall, completely consumed everything in the fire pan. Nothing--not even an ash remained. Remembering Elijah on Mt. Carmel I perceived this as a sign of a great work of God.
The year was 2001.
When I look at lower Manhattan I think I know what the sign foretold.
We won't know about this one until after the fact.
In the rubrics of the old rite, the closing of the book formally signifies the end of the liturgy. In iconography, the depiction of the Lord with closed book frequently signifies the Last Judgment, when the time for evangelisation will be over.