He'll feel bad about that once he knows more about Catra, but for the moment? There's a bit of relief that he's not the only one in that kind of situation.

He looks around a moment, then raises his hand and made a gesture, murmurming, "Muffliato." The area around them became somewhat quieter, though there's too much sound to be entirely silenced. "There. That should keep us from being overheard." It's better not to be overheard if they can avoid it.