To September, magic is nothing more than an example of Clarke's Law. While he does see the energy surrounding boy and butterfly, it's sufficiently similar to the signature of extradimensional energy that he doesn't pursue it much. He does take out his notebook and write this down. He does not, however, remove his attention from the boy while doing so.

The story of how the butterfly was created reminds him a little of something his subject friend(?) Walter Bishop would do. This inexplicably softens his objectivity a hair, and he finds himself putting a hand out for the butterfly to land on so that he might look more closely at it.

"There is a link between your mind and his," he murmurs.