In a ravaged version of Sonic 2's Emerald Hill, There is what seems to be tails with his back turned which you didn't get to see the full face of "Tails" before he turned around fully, showing to be Delirious Tails before laughing maniacally with his eyes rolled back before before his face turns back to normal and his body twitches as he moves.

Delirious Tails was twitching Insanely as He now holds the body of Sonic before he takes Sonic's Soul and throws the soulless corpse away