Tom i can help you out a little on this as i see charles do his lecture at the magic club i attend last week.
ill give you the basic plot of what i see it as.
The performer picks two spectators (they dont have to be near each other its probally better if there not). one spectator is even and one spectator is odd. The magician passes out one odd and one even numerology chart. The magician then turns away and as i see it there was no fishing of any kind. The spectator runs there finger around the chart and the magician shouts stop at any time and thats there number and this happens to both spectators. Then the spectator recieves a scratchcard and scratches off the number to what each spectator stopped at and it reveals a country or place in the world. So the magician begins to read there mind,body language or however you want to present it and he writes a place on a piece of paper and it matches the first spectators scratched answer then he does it to the second spectator and obviously the magician gets it right again.
So thats how i see it also the scratchcard had been about half used before hand so i could see the already scratched half were different places. Also most of the places on the scracthcard that i see i couldnt even pronounce they were really long and strange names anyway hopes this helps in some way because i dont have it but i did see it first hand

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