On "Breaking Bad," Gus, Mike, and Jesse fly down to Mexico on a prop plane. They cave to the cartel and Jesse cooks up Walter's meth recipe. Gus looks like a beaten man.
Yet, wait, the bottle of alcohol he gives the head of the cartel as a gift is poisoned. Many of the members of the cartel die. Gus tried to throw up what he drank but obviously he can't all of it. On their way out of the cartel headquarters, Gus gets very sick and Mike gets shot. Jesse saves the day by mowing down tons of members of the cartel.
Will Gus live? Will Mike get medical care?
Meanwhile, it's Junior's birthday. He goes over to his father's place to thank him for the car that's less expensive than the red beauty. The father doesn't answer the door. Junior threatens to call 911. So Walter, battered and bloody from the fight with Jesse, shows his wounds. Concerned Junior asks him what happened. The weight of the last year and perhaps Jesse's betrayal finally crush him. He sobs. The anguish seems regret for what he had gotten himself - and his family - into.
At any time Gus can kill him, Jesse can kill him, and/or Hank can discover the meth farm. Walter has much to be remorseful about.