Last week’s midseason premiere ended with a seemingly happy cliffhanger for a change: An expression of happiness on the face of a character, Andrew Lincoln’s Rick, who had just come upon and recognized a familiar person from the past. Who is it, and what happens next? That’s the launching point for tonight’s episode, which continues the twin themes of reunions and resistance. And there you go – The Walking Dead, these days, is a drama about scrappy survivors banding together to resist the tyrannical demands and moves of an unpredictable new ruler who has taken charge. More pure escapism…