There are 3 things you can take away from what Pedro demonstrates and they are "where is the second ball going?" "where is the second ball going?" and "where is the second ball going?"
#1 http://www.youtube.com/watch?v=r3tIt-fFqaY
#2 http://www.youtube.com/watch?v=OlWhRXNlOpU
#3 http://www.youtube.com/watch?v=0s0ZG_cGaJU
#1 http://www.youtube.com/watch?v=r3tIt-fFqaY
#2 http://www.youtube.com/watch?v=OlWhRXNlOpU
#3 http://www.youtube.com/watch?v=0s0ZG_cGaJU