Cross, as always, just spouted a bunch of bullshit.
"Yeah… I'm the one who should apologize for saying so much without knowing your situation."
"Um, are you okay? Are you maybe lost?"
"Um, Sylphy? This 'special place' you mentioned… What exactly is—— […] Sylphy? What's with you all of a sudden…"
"Sylphy? What's wrong, are you okay? Ah, wait… I just wanted to talk for a bit…"
"What's wrong!? Are you okay!?"
That's literally every single thing he said to her from the moment they met before the kidnapping took place. He didn't say anything that could necessitate an apology. Though, to be fair, this dude would absolutely apologize for absolutely anything, even things that have nothing to do with him.
Also, here we have our only opportunity for the kidnapper to die: the boss monster. I really hope the author uses it correctly.