flying stick catching diabolo. Also called "genocide".
go into the "darkside". Then, make the diabolo come from left, and when it arrives on the right at the height of your shoulder, just throw your right stick. Then, draw the left stick up, that will accelerate the flying stick. The flying stick make then a big turn and when it comes back toward the diabolo, the string passes under the diabolo. When the stick finishes its turn around the diabolo (second turn since you throw it), catch it rapidly. Not very easy, but very well known among good diabolists.
catch diabolo VS stick + infinite flying stick