[He's not even sure how it all works, and even though Harry said it was "magic" it's not a kind of magic he's familiar with. (Granted he's not familiar with most types of magic yet, but that's besides the point.) He sees the look though and continues the explanation.]

I guess the queen asked for his help gathering a bunch of our memories to build a better defense for Caer Scima. I don't know how he's going to do it but that's gotta mean there's something in the structure itself. Any rock'll work. I just want to crack it open and check it out.