There was a gasp from Sion right before she took the blow. She didn't feel any pain but somehow, she figured she was going to end up with bruises later. If not on her body, on her soul. Or something. As long as it kept Akiha safe, she supposed she would deal with it.

Aim for the eyes. If you put them out, this will go much quicker.

Sion did have a beak on the end of the falcon head that could work great for that, if used properly.