As lookout said, damned if he did. Damned if he didn't. Simples. No matter what we try and explain to you, you contradict it. What's the point of trying? 
Grahame, that makes great sense. If he'd answered all the question the first time they were asked, he may, after his arrest have answered them once more, after which I imagine he'd have thought they were trying to trip him up and possibly doubted his own ability to say the same things again so said little/nothing.