I listened to Feng Xue Er's explanation of the situation and how it got to this point. It didn't surprise me at all that Yun Che was part of the whole damned thing to begin with. Of course he had to go and provoke an immensely powerful enemy just because his…uh, pride couldn't handle being attacked by a prince and he decided to murder the guy in front of the protector.
At the same time, I sort of understood why he was determined to kill the bastard. Let's be honest, if he let the third prince live, Feng Huo Yan would simply return later and try to kill him again…for revenge. It would be a neverending cycle of being hunted and trying to escape again and again. The idiot would harass poor Yun Che for eternity.