I think you wee trying to direct the comment to me. I agree that it refers to the suddenness of the event but it also refers to what people will be doing at the time of the coming of the Son of Man the same things they were doing at the time of Noah. Very good record is found in the Book of Enoch. Have you considered why there was no grace and mercy shown to anyone but to 8 people. Clue:Genesis 3.
#1 My bible doesn’t have the Book of Enoch.
#2 I have no clue about Gen.3 excluding everyone but 8 people for mercy and grace.