It's probably a charge-up ability.
There goes my fun theory of him also having Sophist. Would make for why Edgy Glasses couldn't figure out his power. Imagining a power like Sophist without ever being told would be quite difficult, but I suppose there is just a large enough library that he wouldn't be able to see it twice even if there are repeats.
'Course he could still have Sophist, but we'd be hitting 'contrived twist' territory.