Is There a Supersonic Event on a Fly Line?

There is only one circumstance in which it will happen regularly, if you have a fly, a fuzzy fly, on the end of your leader. I think that disrupts the ability of the end of that leader to snap and create a supersonic event like you would get in a whip. The drag is just too great. It's meant to slow down and not snap. But if i do my back cast and i snag something, and you sometimes don't even notice when you just tick something on your back, castle, a twig or a rock, sometimes you'll do that, and you didn't know you lost your fly. That was a super sonic event. You just reel