He takes notes.
While that's happening...
An angel who's been working in human hospitals since very nearly Revelation day itself dreams of the sun and a voice saying "thank you for your service", and wakes from her weekly nap with knowledge of how to cast spells to make things glow, detect poison, magically clean things in her environment, stabilize the dying, halt the progress of any disease for a day, gain insight into the physiology of a patient to aid the use of her existing magical healing, and cure light wounds.
A teenager whose family has been touring the world in their mobile home since he was a toddler dreams of the moon on the horizon and a voice saying "come and find me", and wakes with the knowledge of how to magically mend broken objects, improve the skills of those around him to a minor degree, create water, restore spoiled food to a safe state, divine how dangerous the next hour will be for him, stay magically safe and comfortable in extreme temperatures, and understand any written or spoken language.
A scientist who studies daeva magic dreams of an open eye in an iridescent pentagram and a sense of being observed, and wakes with the knowledge of how to detect magic, make himself able to read magical writing, improve the skills of those around him, temporarily summon a small wooden version of the eye-and-pentagram from his dream, read books with a touch, summon any of a handful of unfamiliar creatures, and grant the ability to see in the dark.
They aren't the only ones, though there aren't many - five or six total of each sort, over the course of an hour or two, scattered all over the solar system, each with a slightly different collection of spells; mostly humans, though two faeries dream of the moon on the horizon and a demon dreams of the eye-and-pentagram.