What can I say back to him?

well it seems like you backed down at the last minute. what lips were you offering him? you didn't need help to be so fast to ask a question with a question you awe to know what to say you didn't think that he would answer you with a question you should have been prepared for that since you opened the door for him to step in. now it's up to you to answer that question and the next time watch what you say and think before you speak.