and cuts the power cable to the transmitter, but while trying to escape Li strikes Sin down with the live end of the cable. Hsien-Ko, momentarily stunned by the surge of power through her link to Sin, sends Kwok to find and kill Li but then discovers that due to the power surge she can no longer control Sin's bloodlust. Kwok and his men run into Sin in the corridors, and Kwok is forced to flee for his life when Sin begins slaughtering them indiscriminately. Sin then pursues Li to the turbine control room, where Li, unaware of the danger, fires at him with a German grenade launcher and hits the reactor turbines. As the reaction starts to run out of control, Li flees and warns the approaching guards, none of whom are aware of the situation, that Hsien-Ko has betrayed them. As the reactor control room begins to fill with radioactive steam, many of the guards turn on each other, and a battle breaks out between members of the Tong, who no longer understand what is happening or who can be trusted. The Doctor and Romana escape and join Hsien-Ko in the reactor control room, where she is shamed when the Doctor risks his life to repair the damage and prevent the reactor from becoming a nuclear bomb. He succeeds but finds that the chain-reaction explosions have damaged the structure of the mountain and its natural piezoelectric properties will now be enough to divert Greel's Time Cabinet. He and Romana try to return to the TARDIS, but are attacked by Mr Sin on the way; however, this time they are able to destroy it. Despite the Doctor's efforts to convince her otherwise, Hsien-Ko still intends to punish Greel for his deeds and goes to the Temple with Kwok to await his arrival, but just as the Doctor had predicted, the arrival of the Time Cabinet creates a temporal paradox centred upon Hsien-Ko. The Doctor uses the TARDIS to expel the Time Cabinet back into the zygma beam, and it completes its journey but the temporal feedback is shorted through Hsien-Ko's body, and she is incinerated before the horrified Kwok's eyes. Kwok tries to kill the Doctor, but K9 arrives and stuns him in the nick of time. Woo encounters and shoots Li, but he has become sickened of violence and decides to spend the rest of his days as