Is just how effortless the throws are- deep downfield, sidearm, shovel, under pressure, on the run, all kind of weird arm angles, and the ball just flies perfectly out of his hand to the exact spot that it needs to be to maximize the yardage on the play. I don't think I've ever seen any college QB with that mastery- then throw his speedy running on top of it.
He's like an over-spec'ed video game QB.