"Yes, I'm done with that," Megan says with distaste. Not even hearing her, Charlie goes on with his mathmobabble, explaining how an ice cube can be described as "wet," "hard," or "cold," but none of it matters without a basis for comparison. They use fuzzy logic to create a range of those states, and assign values accordingly. By the same token, a person's honesty is not absolute, because everyone lies for various reasons and to varying degrees. He offers to create a "probabilistic statement" and they can use it if they want. David wonders if Charlie already has enough to work on since he's trying to figure out C&C Convict Factory's escape route. Well, it's good that you asked, David, because Charlie's mathmobabble "yielded a very interesting by-product." Don takes a look at the probable escape routes Charlie developed, and decides C&C could have used the subway. Charlie protests that there's a lower probability of that because there are cops at the stations. "Yeah, but not on the trains," Don announces. He muses some more on the route, and runs out of the room. Charlie looks stunned and a little proud. Larry comments, "Well, well, Don has gotten much better with the math." Outsmarting the math is more like it. And also? Couldn't Don have heard the extra-loud train noise over Colby's cell? Amita comments that Don puts on a good game face, but he's clearly hurting. Charlie points out that on top of Colby's betrayal, now Don has to deal with this new facet of the case. Larry hepth-mobabbles about quarks and how the human mind is subject to random fluctuations.
C&C Convict Factory gets off the train and is faced with Don and some other agents bearing down on them with guns. Don orders them not to move. A train goes by, and C&C jump onto the tracks. Don yells at them to freeze as another train barrels through. Colby looks at Don. Don looks at Colby. Carter pulls out a gun and aims it at Don. Just as the train slams by them, Colby knocks Carter's hand down and they pick their way across the tracks. In a very cool scene, Don can see them through the passing windows of the train as they run away. Then the train clears and C&C are nowhere to be found. "AHHH DAMMIT!" Don yells.
In Charlie's Garage of Math and Suitcases -- seriously, who has that many suitcases? There's, like, nine of them! There were five people in my family and we only had three; my older sister and I had to share sides of one large one -- Don tells Charlie that he let Colby go. Charlie tries to contradict this and add that Colby has moved beyond the boundaries of his set deployment by now. Don beats himself up some more and says he was looking right at him. "All right," Charlie says, going to one of his too, too many chalkboards and starting a calculation, "were you basing your decision on his statement, the circumstantial context, or disposition toward giving him the benefit of the doubt?" Don boggles that Charlie is putting it into his equation. "Well, of course -- it factors into my trust metric," Charlie says. Well, of course. Good God, Don -- don't you know anything?! Don tries to puzzle out why he believed Colby, "unless it's so simple as I don't want to admit I was wrong in the first place." Charlie half-rolls his eyes. Dude, the guy wearing a blue plaid shirt WITH A PUKE-YELLOW TIE under a suit jacket is in no position to be so supercilious. He turns to his brother and says, "You have a big ego." Hey, Charlie -- can you write an "algorithm" whereby the pot calls the kettle on the saturation of its blackness? "Thanks," Don says flatly. Charlie clarifies, "You have a ginormous ego." "Thanks," Don says in exactly the same tone. "You're not stupid, you know, you made the best decision you could with all the available information you had," Charlie continues. He then tells Don that based on past experiences, Don was "probabilistically" right. Don muses over this and stares off into space as Charlie acknowledges that life -- unlike math -- is not full of absolutes. Rendering you useless, right, Charlie?