"Bug" finds most of the principle characters looking for a Plan B. Gus needs a way out of war with the Cartel. Skyler needs a way out of her complicity in Beneke's accounting troubles ... and suggests that Walter can quit his dangerous "day job". Jesse needs to navigate between his conflicting loyalties. Hank is sniffing around Gus's assets, since his GPS bug came up cold.
Notably, the only one who isn't changing course is Walter, who takes his adherence to the Plan A of killing Gus and lets it come to blows with Jesse. Their fistfight has been a long time coming. It played out like two men who needed to blow up at each other; in the long run, it will clear the air. (I do remember seeing the teaser with the blood drops, and thinking, "If this is just from a fistfight between Walter and Jesse, I'll be disappointed." Ah, well.) It seems as if Walter is keeping himself in deliberate denial about the direness of the situation, and about how ill-considered his assassination plot is. (After Gus, then what? At least Jesse seems to be considering this.)
Hank is a problem, and his snooping at a time of Cartel warfare would, indeed, be "the perfect storm". He is being handled delicately, for now, but it's uncertain if Hank realizes how high the stakes really are.
Skyler got to do what she does instinctively again and again: put on a damsel-in-distress show to manipulate men. It's terrific dark comedy, and always a lot of fun to see Anna Gunn pull off. She has thrown suspicion off the accounting books, and now it looks as if she's going to go dipping into Walter's money to help the man who cuckolded him. The odds of Ted lasting out the season without suffering at the hands of Heisenberg (or, worse, Walter) are slim; this ain't gonna be pretty.
The primary mover of the action continues to be Gus. After his awe-inspiring bravado staring down a sniper, he acquiesces to the Cartel, and we finally learn what their demands were: half his business, and teach them to cook. But he certainly has a trick up his sleeve. "Never make the same mistake twice" is the lesson he took from his dealings with the Cartel; last week, it seems that his mistake was exposing his cook to the gangsters. So he is planning to go to Mexico not with Walter, but with Jesse, the second-string cook. It's a good move on Gus's part, and his bad-faith dealing with the Cartel hints that he has some sort of stratagem.
The scene with Jesse dining at Gus's house was great. Jesse continues to be the one underling who will stand up to Gus. We saw it when Jesse took Gus's dealers to task for using children, and we saw it again in this episode when he warned against killing Walter. The dinner scene had an eerily familiar air, as it echoed the scene where Gus visited Gale to suggest that he should take over cooking. Learning the truth behind the situation was a well-sprung surprise. There seems to be a rapport building between Jesse and Gus ... but even if the rapport is genuine, it won't stop Gus from expending with Jesse, and perhaps even vice-versa. The two men may be valuable to each other, but they cannot trust one another. Interesting dynamic.
Next week: Breaking Bad goes to Mexico! Woo-hoo! I'll be interested to see if Jesse brings a special cigarette with him, and who might die 36 hours after his cooking show. A broken cigarette on the table next to a bowl of salsa verde ... I can definitely see that image in the near future.