Why was being asking so many question when Adam revealed his true identity?

Being?

I don't know exactly what you mean, but I think you mean, 'Why was Adam asked so many question when he revealed his true identity?' Well, the answer for that is because "Brint" is actually "Mr.Grey" and he isn't actually a docter. He is just trying to decide if Adam (Paul) should be assasinated as the same way as his perents were accused of murder. And that's why he only asked questions about that case.