I adore just how much the city and its people are a character in this. I feel like the superhero boom has largely ignored the whole "saving people" part of the superhero thing to focus instead on the character driven ultra-danger and world stakes. This isn't just a recent thing, of course, there's all sorts of examples of that stuff through the ages, and I'd actually say that most superhero comics largely ignore the saving people idea. It's in the background; they're confronting world-ending dangers and thus saving everyone, but the world isn't a character. It's abstract.
Here, it's not abstract. They're defined people. Crowd shots are detailed, did you notice? There's always people in the crowds, never indistinct shapes. You can pick up on their character a little, even. The handsome-ass wetsuit surfer guy, the other surfer guy with long hair and trunks... you can feel a little bit about who they are. It's very nice. It also makes Golden man's concern for them stick with the reader, too, and their inclusion on the page makes you think about them. When he got tele-punched into the wall, they made sure to show that there was a GUY there, too. A beardy guy in a sweatshirt. So when the train gets lifted up, you're remembering that there's other people around this beach, and you go "oh shit they're gonna die" and thus when Golden man has the same concern...
See how it works? It draws you in by making you remember things, forcing you to ask questions, and then answering those questions. That's how you raise stakes and keep the audience involved, by urging their involvement and then answering it.