"HA! Yeah well..you got the better end of this deal. Apparently where I am from, only my soul gets to come back."

Not bitter. But he knows he probably has to prove it by telling the one thing that only he would know. "If you want further proof, I can tell you about the time we gave up our golden core and the multiple days of misery that was."

He really doesn't want to have to go into that detail but just the fact he knows it should be enough.