@kaz nailed it when Vine launched back in early 2013, the app which looped 6-seconds was perfect for sports clips, especially that amazing slam dunk or football catch that you just had to see several times to appreciate or understand. The unfortunate problem is that in order to create a sports highlight Vine you need to be able to stream a game on your phone or laptop and we are not quite there yet.
In that sense, Vine was a few years before it’s time and, as we all know in tech, timing is everything. Creating Vines from your own live videos was a challenge of being in the right place at the right time and it wasn’t until after the buzz died down that they added the feature allowing you to upload old videos and creating loops afterwards.
Sorry to hear that they are shutting down. For posterity, here are my two feeble attempts to make something interesting. It was fun while it lasted!