Here are clips from the 85kg Warm Up Area at the 2015 World Weightlifting Championships.
It was pretty busy in there. You focus on one lifter and you miss 2 attempts happening behind your back. And before you know it you already have to rush back out to capture the last competition lifts.
Update 02.02.2016: Here is the Clean & Jerk video.
And yes, Tian missed one of his last warm up attempts, just like last year with 200kg.