"I never killed to just kill." He always had a reason, a purpose. He killed for revenge, or because he was told to or because it was necessary to get things done. Xue Yang's reasons might not have been obvious to all but they were there and so it isn't like he cared to kill anyone on the train. But when she arrived, he had become blinded by anything but his need to finish what he started. But trying to make anyone understand anything besides the fact a girl was killed..is impossible.

He places the candy in his mouth and closes his eyes as he enjoys the sweetness of it. A small pleasure in a body worn out from pain.

"They control it by making me stay in one place like any imprisonment. I'm just given occasional.." walks? exercise? A change of scenery so he doesn't go completely mad? He waves his hand dismissively at whatever this is. Which means the chances of them running into each other are only open to a small window of time.