Elizabeth's story sounds surreal. If not for the knowledge that Leon now had concerning Minato's world, with the Dark Hour and the Shadows that had populated that hidden time, he would have been even more skeptical of what she said.

"So you're trying to save his soul from eternal ... guardianship." He's not sure what the implication was otherwise; could it mean that being this wall meant he was also being harmed every time Erebus attacked the wall?

That would be horrifying. He tries to put that thought out of his mind.