why does vincentio say that he is "amazed"(line 54) by his encounter with them?

"What am I, sir! Nay, what are you, sir? O immortal gods! O fine villain! A silken doublet, a velvet hose, a scarlet cloak, and a copatain hat! Oh, I am undone, I am undone! While I play the good husband at home, my son and my servant spend all at the university."

The exchange involving Scene V/ Act I is quotes above. The word "amazed" does not appear in this exchange. Are you sure you have the right act and scene?