There is actually an interview with Amaral where he talks about observing Kate's reactions in a meeting with Kate.
It was supposed to be Kate's reaction to being asked about the 'sofa' theory (that Madeleine fell off it and died).
That question could only ever be put in arguido interview and Amaral played no part in those interviews.
Yes whenever the subject of his own personal contact with the McCanns came up (interviewers also seemed to have no idea that he had never met Kate and only briefly met Gerry) he wriggled and/or lied IMO.
It's a pity that no-one ever asked him directly whether it was true that he had never met Kate or spoken to her in his life. But as far as I could see he was simply asked questions and then allowed to sit on the couch and say whatever he liked with no awkward questions being asked at any time.
I believe there was just one interview where he didn't get such an easy ride - but I can't remember who it was with.
All from memory so I'm happy to be corrected if necessary.