If you haven't had the pleasure of watching any short-track speedskating in the past 10 days, it's complete chaos. With everyone wanting to remain as close to the middle of the rink as possible, collisions are almost inevitable. Sometimes, it's just one skater losing his or her balance, but sometimes it's the result of intentional interference between racers jockeying for position.
It's up to the officials to determine whether a penalty needs to be given for interference, in which case the penalized party is disqualified. In the non-medal races, the skater or team that was affected by the penalty gets to advance to the next round—which means there are more skaters than usual in the following round, creating even greater likelihood for another collision.
Video review in this event is a necessary evil, and it takes an absurd amount of time. The final of the ladies' 3,000-meter relay race took a little over four minutes to complete. After it finished, everyone stood around at least that long, staring at the official and the big screen to find out if anything illegal happened.
South Korea crossed the finish line first, followed closely by China. Both Italy and Canada suffered a fall late in the race and ended up finishing much later, with the Italians initially in bronze-medal position.
And then they waited.
Several minutes later, the official determined that both China and Canada had committed penalties—if anything, it looked like the Koreans were the ones responsible for Canada's wipeout—which meant South Korea won gold, Italy moved up to silver and Netherlands won bronze by placing first in "Final B" a few minutes prior to the gold-medal skate.
Source : http://bleacherreport.com/articles/2760410-pyeongchang-winter-olympics-2018-day-11-winners-and-losers