Rovinski rolled out on the hard snow, and the propelling wheel revolved rapidly in the air.

The Pole gathered himself up quickly and turned his sledge back into its proper position.

He did this in such haste that he forgot that the wheel was still revolving, and therefore was utterly unprepared to see the sledge start away at a great speed, leaving him standing on the snow, totally overwhelmed by astonishment and rage.
Marcy was near enough to view this catastrophe, and he stopped his sledge and burst out laughing.

Now that the fellow was secure, Marcy would wait for his companions.

When the others had reached him, the three proceeded towards Rovinski, who was standing facing them and waiting.