Since about 1850 the concept of the Rapture has existed.  But particularly within this generation, we view scripture through the lense of a very muscular latter-day hermeneutic men developed over decades in support of a particular eschatology.  (Perhaps most recently given rigorus intellectual treatment by Geisler, for example.)   Rapture theory. In the case of the story of the two people in bed, one taken and the two women grinding grain, one taken -- we have always heard it taught that this is picture of the Lord come to "take us home."

"And they will weed out of His Kingdome everything that causes evil and all who do evil." Mat.13:42

“Just as it was in the days of Noah, so also will it be in the days of the Son of Man.People were eating, drinking, marrying and being given in marriage up to the day Noah entered the ark. Then the flood came and destroyed them all.

“It was the same in the days of Lot. People were eating and drinking, buying and selling, planting and building. But the day Lot left Sodom, fire and sulfur rained down from heaven and destroyed them all.

“It will be just like this on the day the Son of Man is revealed. On that day no one who is on the housetop, with possessions inside, should go down to get them. Likewise, no one in the field should go back for anything. 

Remember Lot’s wife! Whoever tries to keep their life will lose it, and whoever loses their life will preserve it. 

I tell you, on that night two people will be in one bed; one will be taken and the other left.  Two women will be grinding grain together; one will be taken and the other left.” 

“Where, Lord?” they asked.

He replied, “Where there is a dead body, there the vultures will gather.” Luke 17:26-37