death spot have looked like? barhmann showed jurors a video reenactment using a dummy to show how bad that fall can be and the coroner described juanita's brutal injuries on the way down. but he also found one injury he thought was suspicious. this mysterious double bruise on her right thigh. >> i think those two linear bruises are the result of one impact, something that was sort of elongated linear, like a rod or a stick. >> a stick or maybe a kick from tom. the prosecution's next witness might shed some light. tom's former karate instructor. 15 years earlier, tom had been on his way to earning a black belt. >> what moves or kicks or holds would he know? >> anywhere's between 15 and 25 different kicks. >> it would take just one of those kicks to knock juanita off balance and off that cliff.