Here's a clip from bakugan.jp website. Note it is probably from way back when they first started the game because it only has 5 attributes instead of 6 (no Ventus). The first few seconds show different ways to roll your bakugan:http://www.bakugan.jp/jpn/media/tec_bb.asx
i never thought of using fingers like a ramp. Also why do the Japanese always have cooler stuff, look at the backs of those cards, awesome looking! side topic/rant: Also the opening of the anime is better in Japanese.