Dutch Olympian Epke Zonderland is a very good gymnast. This is evidenced by the fact that he's at the Rio Olympics and didn't have to buy a ticket. However, he had a very bad day on the high bar Tuesday. He got some serious air showing during his high bar routine, but it ended with him losing his grip on the bar and face-planting pretty damn hard.
Thankfully, he didn't appear to be too badly injured by the fall. He got back up on his own and didn't look totally dazed. Outside of disappointment and a red forehead, he looked to be doing ok. That fall was the end of the day for him.
Seeing incredible gymnasts like Simone Biles do her signature move and make it look easy can mask the fact that you're going to bite it sometimes to get to this level. It goes without saying, but it's a lot harder to pull this stuff off than these athletes make it look, even when they make it look hard.