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when you downshift you take foot off gas and push clutch in. engine rpms drop (say to idle at 800 rpm) but wheels (transmission) still spinning at whatever rpm they were at when you started the procedure (say 4000 rpm). to just release the clutch would slam the engine pretty hard, so what you do is blip the gas prior to releasing the clutch to try and raise engine rpm to match transmission rpm.
when driving aggressively into corners you are braking and downshifting at the same time because you want to be in the proper gear on exit from the corner. gas and brake use same foot, so in order to do a throttle blip, downshift and brake all at once you have to use part of your foot on the brake and part on the gas; heel/toe, side of foot, whatever.
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