To do a hover board attack you have to hit these buttons at the same time. up, r1, x, = flip attack. To do the other one you have to hit these buttons. Left, right, r1, x,= side spin attack. Hold these until jak lands and you'll boost if you did it right. A sign that you did it right is the board will turn blue and you go a little faster. To kill guards it willl take about 3/4 hits. Note: the directional movements have to be done with the analog stick.