There is a dancer, she new at ballroom and at the dance I noticed one of her "dance friends" was trying to get her to do a new step from behind her - he also had a hand grabbing full on her breast and it stayed there while they moved around. I was surprised as I have never seen this except in brief instances by mistake but this was ongoing as they moved around the floor. He is quite a bit taller - so maybe this accounted for it? He does give her a lot of attention so appears to like her for more than just friends as she is attractive and petite. Later out of the blue, she complained that he had made her uncomfortable by moving her too strongly and getting too close but she was confused, upset with other things on her mind, and did not want to be impolite to a dance friend. Does this "gentleman" need to be consulted with by friends or dance mgt or possibly apprehended during his "misdeed or accident?" What to advise?