Turning back
Flashbacks of what had happened to Leo was going through Quinn's head right now. After that day, there were a few times where Leo had explained to Quinn about what happened, how inside his body there were two types of auras. The aura known as Qi, the aura that Quinn now knew as life force. This was something every human had, but then there was a second more sinister type of aura inside of him.
That aura was the red aura. As soon as it latched onto Leo, it started to also latch onto his whole body, chasing his very cells inside. It was like a virus that multiplied quickly, trying to take over the body. With his Qi, he was able to slow it down, but that was it. In the end, there was nothing else he could do, and eventually, he ended up becoming a turned.
Quinn didn't know who this was, but it was clear by everything around him that he was looking after him, and because of him, somebody was going to get hurt or was in the middle of getting turned.