"There must be a way..." Spot muses, half to himself. The thing is, if there is a way, he can't think of it - there's three million people in this city, and the only way to tell if somebody has Ezra's power would be to catch them at it, and there's no way to watch everybody at once.

"We'd need to figure out if it happened anywhere else." he says eventually "Look through old newspaper stories, find similar accidents and talk to survivors."

It wouldn't be easy.