Watch the vid again.....it seems to me that the oval feels a bit too small - Seriously. 10 meter short or something?
Good catch. Replay the video then look at the 400m staggers. The runners on the outer group started in lane 5 on the 400m stagger. That starting line means they were supposed to BOTH curves before breaking. They broke after the first curve.
Whomever marked that track has some 'splainin' to do?