Harai Goshi Gaeshi as is the 'Sweeping Hip Throw Reversal', primarily utilizes core motion that breaks a body's balance with a unique type counter when in use where it will be best to utilise it against their usual sweeping action to exploit it while having that counter type approach of that harai goshi form while setting it, in effect it forces an almost direct counter, usually by using a strong based set and a lift, to prevent any sort of sweeping, while at that very same timing using that upper motion while sweeping in tandem while pushing from core and hip areas while creating angles when moving by lifting that limb by also forcing your body through all rotational directions during movements with sweeps and also creating openings which result in destabilization before take downs or control on top. As one transitions or counters a powerful rotational takedown approach.
Videos from these amazing creators were referenced on this page