Not come across many "dragon-slayers" unless you count someone like "scholar" who used to post on here.
I've gone on JW's blogs that the odd one will have. Was on one recently, but after a couple of posts, that were just simply pointing out some of the things he posted were wrong.Using WT material to show him and point out changes in doctrine.
He changed his blog so that before anything could be posted he could vet the contents. Nothing of mine was ever posted again.
Apart from that I get the odd email I've had from JW's. Who tend to start off OK but under the pressure of debate tend to fold.
They usually think its like speaking to someone on a doorstep. They use the same phrases and approach. But they forget that unlike someone standing on a doorstep. I can put my hand on the knowledge I need to refute the points raised.
Then they usually tell me that I'm going to die at Armageddon.