I believe you are incorrect. In this video, had the umpire only been a step or 2 in fair territory, he would have easily seen the foot off the base. In most cases, the throws do not pull the 1B to the RF foul pole. Once in awhile, no matter what the umpire does, he will be straight lined on a call from time to time. It happens. If you can always read a throw to avoid being straight lined, you should be above MLB level because obviously even this MLB umpire got straight lined.