He's not surprised that they're rare - they look unique enough to be considered rare, perhaps even rarer than some of the Digimon that he's been able to see thus far.

"Interesting. Is he from yours?" he asks - taking his cue from Ginko to offer a palm to one of the rat king's heads, mimicking him somewhat and hoping that he doesn't get his hand bitten off somehow. "Your world, I mean," he says, clarifying.