In an instant, how, Margaret did not see, for everything danced before her eyes--but by some sleight of wrestling, Frederick had tripped him up, and he fell from the height of three or four feet, which the platform was elevated above the space of soft ground, by the side of the railroad. 
In an instant - how, Margaret did not see, for everything danced before her eyes - Frederick had tripped him up, and he fell three or four feet from the platform to the soft ground below. 