Percy was intensely focused as he exerted himself to close a crack, displaying his anger through his fiery gaze. The tension in the moment suggested that he was channeling his frustration into action. Meanwhile, the observer felt a mix of concern and understanding, realizing that anger could serve as motivation for him.
Despite the possibility that Percy might be upset with her, she acknowledged that his anger was a natural reaction to the situation. She accepted that if his anger fueled his determination, it was a reasonable trade-off, allowing him to press forward in their endeavor.