It was easy to see that Grace had the determination. However, Clark could tell that she still had a lingering fear. She wouldn't have the others to support her in this. It was already known that Isa had helped her own in the dungeon before. Isa hadn't hidden this but what else would happen? That had been Grace and the others first time in a dungeon. They had very little real combat experience.
This was more evident in the way that grace moved. Her footsteps were more silent than other people would be because of her wind type beast. She had unknowingly always trained her steps to be more silent and her body to move in a way that would not cause sounds to warn others.
But her movements were crude. Instead of flowing as the wind would, she was making broken movements. This showed that Grace had not trained in a specific movement technique nor had she gone in to in depth movements that replicated her wind whistler's movements when it formed a body she could see out of wind.
Rats are everywhere. even when you can't see them...yeah that's a bit sketchy