Here's a video giving a little more information on how to do the volley. I'm using a 16-plait 6 ft kangaroo bullwhip that I made. I currently hold the Guinness World Record for the most bullwhip cracks in a minute, and this is the whip I used.
The volley is best done with a well-made whip, with firm plaiting, 4-7 ft long if a bullwhip, or 3-6 ft long if a stockwhip. If your whip is really supple, like a wet noodle, or a piece of rope, you will find the volley difficult to do well.

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