> "All the previous times you had taken a shadow, I believe you said that it felt like it was enough, but that the feeling eventually subsided. This is because, while your actions did serve to remind people that shadows have spirits, the actions were done on a small scale, and nobody knew you did them, save for Nitori and presumably Kogasa. What you did to Bhava-Agra, however, was a grand scale event. Everyone in Gensokyo AND Bhava-Agra took notice, and even if they didn't necessarily know it was you that was responsible, it was still a significant event, and people would still have been able to notice Bhava-Agra casting improper shadows. Your action served as a reminder to a great many that shadows have spirits, and it is this renewed knowledge that sustains you."