If the script followed a normal development, both of them should have braked normally, with Qin Miao possibly braking a little later to deliberately block the opponent's line.
But Qin Miao didn't do that. Instead, he deliberately squeezed the opponent's position to the right before reaching the braking point.
Moreover, when executing this aggressive maneuver, Qin Miao momentarily had a flash of insight, perfectly leaving just one car's width on the right side for the opponent while defending.
Qin Miao made this move partly to gain more track width to slow down and enter the curve, and since he had kept to the middle of the track without changing lanes before making this move, it wasn't considered a defensive line weaving.
Another reason was that doing this could compress the space of the car behind to some extent, affecting the rhythm and speed of the trailing car.
The opponent had no choice but to slow down due to Qin Miao's sudden maneuver.