Well, I do, anyway. It's time for some unabashed emotional expression. The second scene here (pages 3&4) is by request, but I added the first one (pages 1&2) just because I thought it was interesting and fun.
Elijah was still pretty young here, and everything I say about Stu's personality was more likely developed by the director (Jon Avnet: Fried Green Tomatoes) than by Elijah. But the director still needed an actor who was able to become the character he envisioned.
Stu is very obviously more extraverted than most of Elijah's characters. His emotions are "right out there." In this role, we need to watch for intensity more than nuances (although the nuances are there, too).
Stu is also someone who lives in the moment. It's not that he doesn't think about things, but he does his thinking at the time, rather than before or after. There's not much long-term planning or consideration of future consequences. The time to decide how to deal with something is when it happens. While this has its drawbacks (and consequences), it lets him be in the moment more than most people are.
With that in mind, compare Stu's face and body language to that of the second boy as they head down the hill: