Can You Solve this Ice Diamond Riddle? ft. Vsauce’s Michael Stevens

Sudden means it had to stop quickly and unexpectedly. When you throw a ball upwards it looses it's velocity constantly and you expect it to stop at some point and come back to you. I think some info to mislead you and make the riddle more challenging is ok as long as the info is true which is not the case with the word "sudden" here.