I wouldn't be surprised if it was the split screen trick, the camera has a lot of wobbling which could be added as an effect to help hide any flaws with the split screen, he'll probably come up with some incredible sounding system on friday to make it sound cleverer than it is though, I wouldn't believe all the explanations he gives on tv. Personally I've found a lot of his tricks dissapointing, in his truth or dare series I remember being unimpressed by all of them, the only one I can remember right now was when he claimed to make some girl with no piano ability able to play like a concert pianist without ever touching a piano, yet at the end he revealed she was actually a music college student, that's just lying He's undoubtedly very good at what he does though and very clever.