Here's the vid:I don't know but!
Meta-Knight got caught in his Down-B and WENT UP 100%!!1!!
http://www.youtube.com/watch?v=PZ9hKHQF6Ws
Look at 00:22 to see him do it.
Also, take note how in the beginning of the video, as DK does his Up B, watch his landing. He seems to have more lag