"However, King Crimson has already seen through it. Your movements in the future. The trajectory of your movements in the future."
"No matter who you may be, everyone goes through their ups and downs. You succeed, and you fail. But if you happen to find the pitfall known as the future that's right in front of you and manage to not fall in, you will never experience a setback in your life. You will remain in your best condition. Don't you think so?"
Epitaph (though everyone calls it angry forehead, Sir Nighteye, or foresight for some reason) is a spell that allows the caster to give anyone the power to see three seconds into the future (reliably) and further, unreliably. Epitaph's future isn't immutable, in fact, it constantly recalculates and updates its premonitions as new data becomes available. The range is generally what the target can percieve (see, hear, touch).
Now, I do have super technology (full-fledged molecular nanotechnology, thank the ribosomes and the enzymes) and magic is supposed to be just super technology. However, I'm struggling to figure out how foresight could work. It's a general rule that if there's some kind of an ancient network or system (like satelites), it's inaccessible to ordinary people, courtesy of the system administrator and no one can just build a new Internet, especially not because of an obscure 9th level spell.
How could foresight work?