Why did Yang Yi leave the mall only to return to the parking lot? Because ultimately he wasn't satisfied just with his own escape. Since he intended to act as a safety valve, and now that he had a car, of course he had to go back to the parking lot and drive it. That way, he might be able to save Brian and the others at a critical moment.
Of course, the likelihood that he could get in the car and then pick up Brian and the others was very slim, but as long as there was a possibility, Yang Yi was determined to be prepared.
Yang Yi took the elevator to the second floor. He exited the elevator and began walking towards the parking spot of the middle-aged man.
Yang Yi had only walked a few steps when he heard the sound of hurried footsteps coming from the emergency stairwell; someone was running up to the second floor.