Sonic the Hedgehog: What did you do?
Shadow the Hedgehog: What I had to!
Shadow the Hedgehog: When we're done, there won't be anything left.
Sonic the Hedgehog: Hey, no cheat code!
Tom Wachowski: Sonic, you finally found your family. I know it hasn't been easy, but you didn't change who you are in here.
Sonic the Hedgehog: Yeah, in my lungs.
Tom Wachowski: Or your heart.
New todayAnswer: Hey, it's a video game movie. Logic may not necessarily apply here.
Rob245
New todayThis isn't a valid answer. Logic doesn't have to apply; the question is, what in-movie or in-game reason is there? If there's no explanation given, that would be a valid answer. Pointing out the obvious is pedantic at best.
Bishop73