Flat color because meeeeh lazy...also, I hate how his right foot looks.
So on a peaceful day in the Scrap Brain Zone (as peaceful as it gets there), Sonic is just running as per usual. When from the sky, Sonic notices a large shadow, slowing getting bigger and the sound of something falling from a great height. He doesn't have time to look up as Scratch scraps Sonic's brains for great justice.
Thanks to Scratch's weight Sonic is now as flat as paper....or he's dead.