at our school the new senior student is showing his true colors and is not respecting the teacher.in short there is a show of open disrespect, defiance and questioning the sensei. It's really causing tensions and harmony in th the dojo. The sensei is too kind and too nice of a person who I don't know how to deal with the situation effectively. I don't think to send to one conflict in the coach of himself and the new sempai. The good, old Sempai moved out of town BTW. any suggestions on dealing with this problem of disrespect in an otherwise harmonious dojo