When they reached the 51G corner, Qin Miao hadn't been completely overtaken by Hamilton; he was still holding the inside line, putting pressure on Hamilton.
Although Old Man was also adamant, Qin Miao didn't leave much room for Old Man to exit the corner.
It seemed that Qin Miao took a poorer line into the corner compared to Hamilton, as Qin Miao wasn't entering from the far left of the track; there was a Hamilton car between him and the left edge of the track.
However, Qin Miao hit the apex at T9, giving him a better exit angle, while Old Man, who should have had a better exit angle than Qin Miao, was completely blocked by Qin Miao's car on the inside line.
So by the time they came out of these three consecutive corners, Qin Miao had already regained his position.
