just watched it again. I think I see her problem. She is outside lane 2 next to Cain, and that small space between them is another runner(this is what happened at olympics as well..I think?) then she ever so slightly moves in a bit closer to Cain, right where a very close following runner is. I think Uceny's issue is that she drifts between the outside and inside of a lane without thinking anyone is filling that gap. her spatial awareness is off, or she just doesn't get that lanes are big and if you give room someone will take it!