Something has come over Sonic and he is trying to chase us. For being so big he's still amazingly... and scarily fast too! He's gaining on us.
Got the idea for this by the Sonic Boom episode "Mech suits me", where Sonic gets a mech suit and it starts to take over him. Although in this case, Sonic IS the whole (not so good) shebang being a hulk-type. I'm not sure what is scarier, Sonic being engulfed by a a strong robotic suit chasing me down or an enormous muscle-bound Sonic.