[Ralph's smile diminishes when Vanellope jumps and completely vanishes once she glitches red.

The glitching's bad enough, she had that under control where she only glitched if she wanted to. So, for Vanellope to suddenly glitch like that is unusual. But, what makes things worse is the red added to her glitch. There's only one person Ralph's seen glitch red, and that was Turbo.

His tone is full of concern when he responds to her.]

Yeah, it's great and all, but are you feeling okay, kid?