These are excuses common Missionary/Christian debaters do to run away.
1. Claim all your sources are biased. For e,g in a debate i linked articles to this site,they ignored and claimed it as biased
2. Out of the ordinary Name calling,for e,g I had someone who told me he will Pray God curses my family
3.Silence for atleast an hour,then replies,which means the opponent is running out of ideas.
4. A instant ban/block from their chat.
5. Targetting your personal info,etc such as age,etc after this they usually ban or block you,or kick you out of a certain chat.