The remaining thug, seeing that eight of his comrades had died and their leader had jumped into the sea to escape, lost all will to fight and also wanted to make a run for it by jumping into the water.
He and Lin Qiong were evenly matched to begin with, and having been caught off guard by her sneak attack at the start and sustaining some injuries, he had been at a disadvantage throughout. Now, utterly devoid of fighting spirit, he fared even worse. Just as he tried to turn and jump into the sea, Lin Qiong's leg whip crashed into his thigh, sending him thudding down onto the deck. Lin Qiong's right knee bent as she knelt on the thug's back, her hands seizing his right arm and twisting it forcefully away, rendering him powerless to struggle.
Killing wasn't her forte, but incapacitating like this, Lin Qiong was quite adept.