What happens in this video ?

Prague, Czech Republic – October 4th, 2016 – Strong cross-winds nearly led to a disastrous landing at Prague’s Airport. The Boeing 737-400 operated by Air Horizont from Naples, Italy, attempted a dicey landing in Prague with crosswinds gusting at 26 kts. The aircraft is bowing back and forth as it nearly touches ground, only to pull back up at the last possible moment.