from grace promptedly the strongest response yet from i.o.c. president thomas bach. >> i was very, very disturbed. >> reporter: bach says he was especially concerned when he saw her coach scold her. saying, "why did you let it go? why did you stop fighting?" >> when i afterwards saw how she was received by her closest entourage,s with what appeared to be a tremendous coldness, it was chilling. >> reporter: valieva tested positive for a banned heart medication in december. but she was cleared to compete, in part because she's a minor. how important is it to start looking at those people within her inner circle? >> it's of extreme importance. doping very rarely #-r happens alone by the athletes. >> reporter: valieva's case has renewed attention on russia's olympic ban for state-sponsored doping, which is set to expire this year. and it's rekindled debate among