Choice
Neither Ryu nor Ailsa knew how to react, quite frankly. Both were in a state of confusion, maybe Ailsa even more so than Ryu himself.
As a Cultus Faerie, there was very little about the bodies of others that Ailsa didn't understand. To now stand here, only to be told that there was something so fundamental about her own that she didn't even aware of… Well, it was hard to accept to say the least.
Ryu hesitated. This woman, he really didn't like being around her. It was already taking more than just a little bit out of him not to go all out in killing her right here and now.
In fact, the only reason he didn't was because… It was truly unlikely that he would succeed even with Ailsa by his side.
This wasn't to say that Ailsa was no match for her. Ryu didn't believe that Sarriel stood a chance against Ailsa, the gap should be too big even for her to cross.