Did you feel sorry for Red in the end?

[Bek]

Does that mean Clarence was tricking you into "hearing" her voice? :C

Possibly, she could have been alive for some small time whilst you where in the mine, or she could have been dead /mostly fictional. You'd have to look at the possibilities with locked doors and what not. Still, Clarence was pretty awesome. The other bit of evidence for this theory I forgot to mention is that because it CAN kill you, it has to be real - because if clarence could make you feel fake pain, enough for you to die from it, he would have used that ability in various other sections to ensure your demise.