A large crowd is standing around the start line.
People are crossing a finish line
One scene is the start of a race where people are standing, and the other scene is the end of a race where they are crossing a finish line. You can't do both, at the same time.
The people cannot be at the start line and finish line at the same time. Also, if they are standing around, they are not crossing the finish line.
One is at the start, the other is at the finish.