Flashback. Warden James and Lucy have a chat in one of Alcatraz's innumerable dark little rooms. She shows him the lyrics and explains how they reveal the locations of Petty's bombs. She doesn't know what the "twin tree" lyric means, but they're both confident the SFPD will figure it out. "Milton," the Warden says, "don't skulk out there like a common ferret." Dr. Beauregard, who's been waiting outside the door, comes inside. He seems like more of a skunk than a ferret, if you were choosing from the Musteloidea. At the Warden's urging, Dr. Beau grudgingly admits Lucy's work is "genius." He tries to skulk back out of the room, but she calls him back. She asks him about Tommy Madsen and his seemingly special blood. Dr. Beau warns her not to "overstep." Pure skunk.
Present. Rebecca and Doc find Hauser still standing on that mine. Rebecca grabs Petty from the backseat and points her gun at his head. "Walk me to him," she orders. "Doc, stay here and call Tanner." That's the guy previously known as Psycho.
During the commercial break, the bomb squad arrived and set up lights and a blast wall. Tanner is down on the ground, brushing the sand away from Hauser's foot to expose the mine underneath. Hauser sure is swinging around a lot for a guy who should be standing perfectly still. He and Rebecca talk about the lyrics of the song and how he still hasn't found the "twin tree" location. When Tanner steps aside to get some supplies, Rebecca follows him. It turns out the bomb has been modified in super tricky ways. He tells her he can handle it, but he's clearly shaken.