His dad finally realized that he should do his part in supporting his son and gave him a well-deserved congratulations before massaging his pained leg so he wouldn't be so burdened by it.
He was so close to winning the championships but his last run and his whole career as a sprinter ended right before it even finished. If osteosarcoma's the same disease that killed his mother, I can only imagine how devastated his dad would be to see his son's dream get crushed like that.