@@gabrielaconceicaodesouza5774 It's not dangerous if you teach the student to pull back on the arm and cushion uke's fall. Also, uke must know his ukemi so that he doesn't strike his head on the mat. In this regard it is good for teaching both an effective throw and ukemi because the fall is much like a simple side fall, as in the ukemi exercise.
Eso no es real, la fricción del piso siempre es mucha como para q se pueda "barrer" el pie del oponente. Además antes de q lo "barran" ya está levantando el otro pie al q derriban. Pura fantasía.