if you understood the first, you should be able to understand the 2nd, better than us who haven't seen the show ...
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Nona The BritOK, generally speaking, serial killers move on to killing human beings after spending some years killing/torturing animals (pets). Nearly all of them have an animal torture history, and this is quite well known. So it's a sarcastic sentence - it refers to the fact that serial killers like to kill/torure animals. So, liking something in the way that serial kil