You let off the throttle, ever so quickly, then right back on, much like you do when shifting with the clutch, just a little quicker. Blipping the throttle is opening the throttle and letting off really quickly. My Interceptor goes both ways, upshift and downshift, really smoothly. The gear ratios must be really close (i'll have to look them up.) To downshift, I do a slight blip, as I would using the clutch, and it drops right into the next lower gear. Not all bikes will downsift very well without the clutch. The ninja 250 does not like it at all. I can do it, but as harsh as it is, it can't be good for it. The interceptor is practically smoother without the clutch.