At some point Lorca was replaced by his mirror - universe counterpart , who impersonated him and reported that ship was boarded , then set to self destruct by him .
Counterpart 's crew does n't fall into Klingon hands and face degradation .
At some point Lorca was replaced by his mirror - universe counterpart , who impersonated him and reported that ship was boarded , then set to self destruct by him so that its crew does n't fall into Klingon hands and face degradation .