Am pretty sure Ruben was flying Best at the event
Looks like he was on his Fuel.
It was White and Light Orange with Black Triangles running along behind the LE, that look like "teeth". VVVVVVVVVVVVVV
Two Red Bulls facing each other on a Yellow Dot at the center of the kite, and then two Mystic logos on either side of the Bulls.
He is at 2:10 of the second video above.