Wind gusts are like the waves of the sea. They wax faster than they wain. So in a headwind a gust will add airspeed and altitude quickly and decrease speed aand altitude slowly = let you down to the runway gently. In a tailwind gust the plane loses airspeed and altitude abruptly and restores airspeed and lift slowly = smack down on the runway. If it is a significant gusting tailwind, request a change of runway before landing. Or any tailwinds because the gust factor is not precisely predictable.