I wonder whether or not all these glitches in every speedrun has broken Sonic's mind. Seriously, I think his attitude is simply a mask of how badly the glitches broke his mind back then. He's just barely holding it together, looking confident for the others...but as soon as they're gone, he's a mindless wreck. He doesn't run fast because he's the "fastest thing alive", because he's not. He runs because in the void where his brain once was, those glitches are chasing him endlessly. Waiting for the day he stops so that the rest of the cast can be broken just like him. Because the glitches are like incurable viruses, spreading from Sonic to his friends until they're all broken shells.

So thanks a lot speedrunners, you broke someone's mind. All because you wanted to be "the fastest thing alive". I hope you're happy.