EDMUND noticed the silence of everyone. When he looked around and saw that all four were staring at him, he began to panic. "Sorry!" he quickly said even though he wasn't sure what he should apologized for.
He just suddenly felt this heavy force inside his head. His instincts told him that if he didn't answer Astrid's question honestly, that force would just get stronger and stronger. So, he just said everything he knew. It was probably because, deep inside, he knew that doing so would not really have that much of a consequence. That's why it didn't take long for him to just reveal everything.
Hildred bit the inside of his cheek to prevent himself from laughing. Really, Edmund could be so wonderfully cute sometimes. But to make him panic like this. He glanced at Astrid. The mental pressure this teenager let out should be extraordinary.