Donald, I wouldn't attribute that injury to being a bad uke. As nage the fellow testing should not have changed gears if you didn't give the extra energy needed to react to the increase in power. I've never attributed injury to someone being a bad uke. If an injury occurs during a technique I've always seen it as my fault for going beyond what my uke could handle, not remembering at what level of training my uke was and so on. Accidents do indeed happen from time to time but most can be eliminated through proper control.