Dont you just love these lines?
By this time the report of the accident had spread among the workmen and boatmen about the Cobb, and many were collected near them, to be useful if wanted; at any rate, to enjoy the sight of a dead young lady, nay, two dead young ladies, for it proved twice as fine as the first report.
In the midst of all the shock and horror of the accident, JA takes us out of the group and shows us the people around, to stop it all being too melodramatic (or at least to lace the melodrama with irony). Classic JA humour