Actually, Prem knows Boun is hot headed but he can accept that so he doesn't think it as flaw. So when asking about Boun's flaw, Prem doesn't think about it until everyone point out that flaw.
I think Prem is also someone like me; when you care for people, you know they have flaws but it doesn't matter so much because those are part of what makes them the person that you care for. Obviously not toxic flaws but like the impatience they mentioned - that's part of Boun's nature so you accept and adapt. 😊❤
Is It possibile to have the translation of the entire interview to fully understand what happened and Is happening. Like that you give some hint but It Is not enough.