"Yeah, yeah!" Mario nods along because he gets it, he gets it. It's hard to shake the memory of Rougeport Sewers, knowing he could get so much further if only it didnt require leaving Goombella behind.

...Wait. "Only a year!? That sounds'a rough... That sounds so rough."

Mario is clearly struggling with more eloquent words, but his patient expression shows that he's more than willing to listen, if Casper has anything else he wants to say - To get off his chest. ...or if Casper would rather change the subject, that's a-okay, too!