Watching the video again, that minion is actually above the Illidan player there and on the very edge of the Void Prison whereas the Illidan is below it. It’s worth noting that The Hunt has Illidan’s model rear back prior to charging. However, if you look at his Hero ring and the center of Lightbomb when Anduin cast it on Illidan (which he wouldn’t be able to cast on Illidan while Stopped), that point is not within the Prison.
I just think it was a really close cast that only BARELY missed. However, the offer stands that if corndog sends the replay in I will confirm that, but without it, I will stand by this analysis.