Betrayal.

Ragnarok turned to her and replied. "Because this looks like an ambush."

It doesn't require a lot of brain power to figure that out. He is surrounded by enemies who have been trying to kill him for many years. It is obvious that they have overcome their fear of the Underdark to get to him. The source of their confidence is also obvious. It is the three origin gods around him who are in a position that very much resembles an ambush. 

She laughed again. She has no eyes but he knows that she is amused right now. That amusement would show in her eyes if she had them. He can tell that she is amused because she transmitted her amusement to him through her divine sense. She wants him to know how amused she is and it grates on him. But other than that, he is not intimidated by their presence at all.