A figure which appears to be Sonic stands before you. He has a slightly darker quill tone, and you can tell something is off by his much deeper voice.

So, you've entered my domain in search of Tails, have you? You're not going to find him here...it's too late to save him, anyways. And soon his head spins 180 degrees and his black, soulless eyes pierce you, his mouth gaping like a void. It'll be too late to save yourself.