@Saybah what's the irony? Is it in the future or has it already happened? Ever since I've caught up and have to wait between chapters I tend to forget about chunks of the plot.
@hife It already happened. Pang Tong is the one who set up Huo to assassinate Cao Cao and thus lead to Sima yi clan nearly getting genocided. In fact there is one chapter of Huo about to snipe Pang Tong but he decided not to and leave the revenge to Sima yi instead.
@Saybah thanks, I have now reread that part. If anyone is interested, Pang Tong gives the mission in chap 184, the massacre is in chap 200, and the scene where Huo has the opportunity to snipe Pang Tong is chap 213.