Lee Sin was a champion that was very difficult to master in League of Legends. It was almost impossible for a new player to play him well because this champion had many skills, movements, and too many combos and routines.
An impressive Lee Sin needed to be able to cast a Q-skill and dash over, and then use his W-skill to get to the back of the enemy and roundhouse-kick them back. This maneuver was already difficult because it required fast finger speed.
The faster your fingers were, the stronger the Lee Sin. There were some, that before the second Q-skill had even reached the enemy, they had already planted a ward behind them and cast their W-skill almost instantly to it, kicking the enemy before they even had a chance to react, and that would be the best glorious operation.
For Luocheng to plant a ward while halfway in motion, gliding into a smooth 'V' shape, the requirement for that was even higher, not to mention this was in a competition!