Meanwhile, Dad Ex Machina's other son is busy running around an abandoned factory with an anxious Dr. Sara bobbing in his wake. Michael looks around and sees something, then urges Dr. Sara on. She protests briefly, but he reassures her, "I'll be right behind you. Go!" She does. These two do well in crisis situations together. They're just not very good with the day-to-day stuff. Mahone comes into the factory, gun drawn. Michael picks up a convenient length of pipe and hunkers down, trying to figure out what he'll do next. We get a series of shots designed to give us the impression that the minute Mahone leans his head around a corner, Michael will whack it, and then Mahone moves in a different direction. There's some more moodily-lit cat-and-mouse pursuit in the warehouse, and Michael carefully knocks over a length of pipe so as to freak out Mahone and make him think Michael's in a much different location than he actually is. Mahone scampers off, leaving Dr. Sara undiscovered.
Cut to Arizona, where Kellerman's day is getting worse by the minute. He's surveying the wreckage left behind by Lincoln's rescuers, and then he has to call Kim with the message, "The news is not good. Burrows was intercepted before I got here. But we're not that far behind --"