If the teacher jumps in front of the mirror, that is, with her back to you, then she jumps with her right hand and you jump with her right hand, so that you and she stand in the same direction and learn in the same direction.
In other words, the front panel means that you are facing the teacher and the teacher is facing you. You face in different directions. If she is right-handed, you have to use your left hand to be consistent with her. The mirror version means that you and the teacher are facing the mirror, you are facing the same direction, and he uses his right hand, so you also use your right hand. Much more convenient, isn't it?