Fang Hong employed what was known as Margin—or rather a technique named "Preemptive Command." His exposure to this technique wasn't particularly deep; counting from when Shana gave him the second stage of the training program, it had only been a week at most.
Of course, he didn't know that in the Second World, the problem of exceeding one command's Margin remains unsolved to this day. It's because, on the leaderboard of that training program, there were several people who could make the Clockwork Fairy lose control and fly for more than three seconds.
That frustrating feeling of others being able to do something that he had no clue about was terrible; he spent a great deal of time each day pondering and calculating on how to solve this issue. There was no progress in training, but he gained some understanding of Margin, big or small.
That's why, when he entered combat, he thought of using Margin as a possibility in the first place.
