-Цитата от Vol't

почему серия felina называется понял кто?

вот ещe пару вариантов
There's the science angle: the word can be split up into periodic table elements: Fe (Iron) relating to blood, Li (Lithium) for meth and and Na (Sodium) for tears. Which spells out what we have come to expect from BrBa.
But more intriguingly is the redemptive song El Paso by Marty Robbins. It tells the story of a man who falls in love with a Mexican woman called Felina and comes to a bleak end. On website Previously.tv Andi Teran has analysed Robbins' lyrics, and the results are fairly convincing. Based on this, she theorises that 'Felina' alludes to Walt's Achilles Heel, his family, but also his downfall in his sister-in-law, Marie, the Felina of Breaking Bad, who delivers the kiss of death.