Well most big characters are in the right position so you can just short hop to the right and D-air them when off the edge but smaller characters you have to time it so you get them while they use there second jump... There was a video of the later option floating around this forums... Ill go get it =O
http://www.youtube.com/watch?v=YAV9CKfcm3k
2:30 in this video is the second type of the chaingrab spike combo
and the video posted above by Yeniths is the easier option but doesnt work sometimes on certain chars
http://www.youtube.com/watch?v=YAV9CKfcm3k
2:30 in this video is the second type of the chaingrab spike combo
and the video posted above by Yeniths is the easier option but doesnt work sometimes on certain chars