Read the conclusion of The Adventures of Tom Thumb.

And now let us see what has become of the wicked ogre, whom we left sleeping on the rock.

When he awoke he missed his seven-league boots, and set off for home very angry.

On his way he had to cross a bog; and, forgetting that he was no longer wearing his magic boots, he tried to cross it with one stride. But, instead, he put his foot down in the middle and began to sink. As fast as he tried to pull out one foot, the other sank deeper, until at last he was swallowed up in the black slime—and that was the end of him.

Which detail best helps readers imagine the scene?

left sleeping on the rock
set off for home very angry
had to cross a bog
swallowed up in the black slime

The detail that best helps readers imagine the scene is "swallowed up in the black slime."