[The explanation makes Kotetsu slightly giddy as well as... not so giddy, because not only has he been confident that his relationship with Barnaby could be strong enough for a resonance to be no problem but also... because Barnaby isn't exactly at the same point as him. Damn differing timelines.]

O-oh yeah, I remember that! Must be why things have been just fine for us, haha...

[The awkward laugh trails off as Kotetsu watches the movement of his hands, and he just stares. Small cube... that small... he could even hold that in his hands.]

...really? It's that small? No like, giant chamber, or creepy hole in the ground, or even a bigger box? Just a cube--?