Convulsions from multiple tazering and hits into the head and spine. It is a catch-22 for the victim - police tazers you, you convulse, ie. resist, thus giving them plausible cause to tazer you more and/or in this particular case to hit your head, neck into the curb, etc... when they hit your head (or kidneys - they professionally trained and very experienced in how to hit you) the brain and spine nervous tissue shock make you convulse, ie. resist, ... loop continues.