It looks to me like he is doing it from memory. He starts off by looking at it and working out a series of moves in his head, then once he has them memorised, he pulls the mask down and does it from memory.

There are two things about what he does that are amazing. Firstly, the fact that he can work it out in his head that far ahead - it's the sort of thinking that allows chess players to visualise a series of moves ahead, but it involves many more moves than that. Secondly it appears that he memorises the moves into a series of groups, and is then able to recall them all - that is amazing. You see him at one point looking for a moment like he has almost forgotten one, then he recalls it.

Yes, definitely a well-trained mind!