Need Help! Creationist/Evolution debate

The problem is quite obvious To which you reply with a huge list.He then complains about your comments regarding the lack of fossils, and you follow his trail directly away from his claim above. Where was your"you said that there isn't single transitional fossil, and I have just listed x amount - please retract your claim as it has been soundly refuted"You mention it later, buried in a huge post, when it was far too late. Simply reply with the above quote to every post he makes until he concedes the point - which he won't, but just keep repeating it anyway. Asking how you know that they are related is moving the goalposts - state this - he wanted transitional fossils, and that is what you have given him. And embellish it with the story of how Tiktaalik's location was predicted. Claim victory, and ask what his next point is - possibly suggest moving on to the evidence showing relatedness. If he still refuses to admit defeat, keep repeating his claim and your list - don't change subject no matter how absurd it looks.