Very simple, but I'm giving you high marks for a well done first level and the fact that your title description helped me evaluate the level. Thus, the level met all my expectations! Thank you!
P.S. Yes, you incorporated a well known exploit. It's a type of path completion exploit where the path is changed and B ends up falling where he had expected a block. There are many more variations, but rather than ruining the surprising ways B can adjust to his path changing, I'll let you discover them. Have fun!
