I've learned this is a different world and there's not been any discovered means of return. [He's really only spoken to people who he can glean tidbits here and there from. But Shikamaru is the type of person who can probably provide more.]

You can fill me in on the details in between. [And while he should have probably phrased that as a request rather than an order, he's not the type to stumble over his own words or bother himself with politeness.]