Yes for the most part what you both said is correct. The difficulty lies in the 'behind the back, one-handed' factor.
Here are a few more behind the back or difficult shots:
http://www.youtube.com/profile?nomobile=1&user=randomtandem369#p/a/u/0/xHCG_oHiS04
Before I reveal my video, here is a revealing preview of the movie 'Poolhall Junkies'...
http://www.youtube.com/user/randomtandem369#p/a/u/2/UBnyKbo0o8w
I have elaborated one of those trick shots into one I greatly enjoy doing...
In this next video I attempt to pull it off 3 times in a row...