"There must be some kind of story or legend behind it[=entrance stone]. Maybe it's famous and on display at a shrine or someplace."
"It could be, I suppose."
"Or maybe it's just in some house, and people use it as a weight when they make pickles." "No, that's not possible."
"Because nobody can move the stone."
"Nobody except you, you mean."
"Yes, I think Nakata probably can."
"After you move it, then what?"
Nakata did an uncharacteristic thing––he pondered this for a good long time.
At least he looked like he was, briskly rubbing his short, salt-and-pepper hair.
"I don't really know about that," he finally said. "All I know is it's about time somebody moved it."
Hoshino did some pondering himself. "And that somebody's you, right? At least for now."
(Kafka on the Shore, tr. by Philip Gabriel)
Why is moved a past form; is it a kind of subjunctive?