[Well... now that he's wearing his helmet, at least Sonic can see the little smile that breaks out underneath its usual, glowing eye.
It's a soft one.]

Aw, hun...
You don't get a soul that heavy [- pointing a metal claw at Spin Jockey -] from just fakin' your death.

You a smart one, though, bein' diplomatic 'bout it all where you can. 'Cause me, that's how I died.
I weren't bein' used as a tool or nothin'... I was a weapon. Aimed at the folks who kept gettin' away with hurtin' others.
And when the day came I got caught, y'know...
Governments don't like keepin' 'round folks who destroy, even if you had a good reason.

So... 's good that you takin' the good-hearted path. Real good.
You savin' folks, that way.

[He's trying very hard to sidestep the obvious, here - he doesn't want to say what all he's done outright and scare the poor kid.
But at the same time... what other crimes are there where the punishment is death?]