Severean and Agia's Duel

Severean refers to it several times in this context, but it just means a duel. They're getting ready for the duel. Agilis is surprised that he's not actually a soldier in costume, but he really is a torturer. He says, no, I really am. When am I supposed to meet up with this person? And she says, well, that'll all happen at the end of the day at the Sanguinary Fields,. She specifically says it will happen when the Avern opens its flower.