This act also caught me by suprise, but only when it came to editing the footage. You see I have no memory of watching this act on Thursday Open Stage but I'm sure I must have as I did film it.
Ironically it's called "Momentos" performed by Dimitar Germanov.
Although there is some amazing skills in this performance, I think it's about 4 mins too long.
For more info on Dimitar check out www.jugglingdance.blogspot.com