Brodie Smith is a flying-disc trick-shot performer. He claims to have successfully thrown a Frisbee disc to be caught by someone zooming by on a zip-line.
A Vine video (advertised by Smith's Twitter account) shows the stunt.
It appears, from more angles and in higher resolution, as the first stunt on this YouTube video.
It was also reported in the media, such as SB Nation, and in SportsCentre's Top 10.
Did that throw happen?
T-(speed of moving target / distance to intersection point)
(and it doesn't hurt that if you're off by an arm radius or less, the other guy will do his best to reach for the frisbee).