Some kind of visual bug happened with the Console Content's screen border when reloading this save and it would stay as whatever the last room's border was. It fixed itself after entering Basil's room at least.
This particular line. It's appeared a few times before. At the lake when you get asked the question, it feels like his fear of drowning is what's making him second guess the choice. But here...Sunny remembers, and knows what Basil's about to do. Despite that, does he want to save Basil? After what Basil did?
Sunny killing himself is usually associated with after Basil died, but its interesting to think of a scenario where Sunny approaches Basil's door and just...decides not to save him. Willingly and knowingly leaving Basil to die. Instead of going back to sleep, he walks home. Picks up the knife, takes it to bed, stabs himself, and that's that. He simply decides Basil wasn't worth saving, and neither was he. Or maybe he doesn't pick up the knife. He wakes up the next morning and moves away after that. After what he remembered doing and what he let happen. What would be going on in the head of a Sunny that made such a choice?