The shock

 Dav's question startled everyone, at least those who were innocent of the accusation he had laid, even some of the servants couldn't process what he had said because they had never heard of a poison that would be strong enough to reduce the king to that extent. Probably because they haven't been born before the abolishment of the poison. 

While everyone was still in shock at what Dav had said, Dav turned to face his mother who seemed startled by the fact that Dav had pushed his focus on her. 

"Don't you dare to ask me that question, remember, he is my husband too."