Sterling is running the Situation Room as they track Sophia. They probably have more than one of these rooms at the White House, right? You'd have to think they have a separate one reserved for international situations. President Martinez enters and asks for some exposition. They're tracking Sophia by means of some radioactive isotopes in her blood. Okay, really quick: they didn't decide to track her until Thomas called, which means that they had to sneak the isotopes into her food just before she was freed. I imagine someone had to casually say something like "Well, we're letting you go in fifteen minutes. Would, um, you like some tacos first? Go on, have some!" Also, I'm not 100% sure it's safe to introduce radioactive isotopes into people's bloodstreams in the first place. Especially ones that are so radioactive that the Federales can track you with a red dot on their computerized street maps. Do you think they have isotope-detectors on every street corner? Or are they tracking this from satellites?
Okay. Regroup. The magic isotopes will stop working in about seven hours, after which Sterling wants to grab Sophia again. He considers her a threat because she and her pals have mysterious powers. Simon has been in the room the whole time and asks permission to join his men in the field. Permission granted! So as soon as Simon's in his car, he calls Thomas. It's a shame all these isotope detectors can't be altered to listen in on cell conversations.
1954. This is a flashback, although I can't put it in all caps because it's just a number. I guess I could type !(%$ but that doesn't seem much better. We're in Venice Beach, CA. Simon and some woman chat on the beach. Simon says the water is warm, although everything is so sepia-toned that the sky is white. So that makes it look like a pretty cold day. The woman tells Simon that he acts like he's discovering water for the first time, and he (PLOT POINT ALERT) says, "Where I'm from, there wasn't any." This naturally raises question about where the heck he was from, but he refuses to get pinned down. Then he says, "With you, it doesn't matter. For the first time in my life, I'm free of it." In the process of telling him she loves him, she calls him "Mason," which reminds me that I like it when fictional characters with long lives have the sense to use different names occasionally. Suddenly! Simon sees Thomas lurking on the beach in a stupid hat.