Sure, he might agree there is a mistake in the paper. He disagrees that it is important.Referee disagrees in what? He AGREES that the mistake in the paper is clear.
I'm sorry, but I feel this is a very selfish attitude. You might get a paper out of it, sure. But science is built on cooperation and free discussions. Science isn't supposed to be a race like this.I have not contacted with the authors, because I wish to have a published rebuttal.