Well... Since they're both AI doing the same project, it might be that they have a built-in connection. I think we should ask River about it.

[ He shrugs, obviously not too concerned with Luke being an alien. He has to trust someone. ] Just being an unmatched swordsman and the ability to break into most doors.

[ It's a joke. He writes down Allen's letter to him, then goes for Kazuma's three letters because... he's morbidly curious. He reads those out to Luke. ] Guess I should really hope that I don't die.